Category: Regenerative Planting

March 24th, 2020 by Mark Laurence

This is the third in a four-part series. In previous articles (links at bottom) I talked about the spontaneous regeneration on brownfield sites in the UAE and the utilisation of seeded landscapes to create semi-natural ecosystems without irrigation. Another factor of these landscapes would be to make them productive in a way that would enrich the soils of not just that landscape but, by the production of useful products, returning fertility to the soil for both the site concerned and also urban landscapes and gardens elsewhere.

Sesbania sesban, a nitrogen-fixing shrub or small tree

Coppice woodland is not a term that you normally associate with the Middle East, yet there are many trees, both native and introduced, that would work in this manner. So what would be the point? Well, we have become used to landscapes being either for agriculture, or for ornament, yet this simplification overlooks the fact that we can have landscapes that are multi-functional and that they can also be productive in other ways.

To understand this concept, we should look to agroforestry, or forest gardens, where multi-functionalism is the order of the day. We think of these systems as being in tropical or temperate regions, yet there are many plants that can be organised and used in this fashion in arid lands. I want to focus this article on one aspect only, the production of biomass. Biomass has multiple functions: the production of poles for building and firewood, compost, and when shredded, mulch. We can produce biochar, which is seen as an increasingly important part of long-term soil enrichment and carbon sequestration. There are also food and fodder crops which would be a valuable product, dependent upon species. And of course, verdant biomass supports verdant wildlife.

Eucalyptus street tree, Abu Dhabi. Note the epicormic growth from the base

Many of these plants are also nitrogen-fixers and these are especially valuable for building fertility and assisting the development of other species. Whilst some may have allelopathic properties, which inhibit the germination of other seedlings within the root zone, my general observation is that this is not particularly effective, nor a problem.

So a list of trees that would grow in the Middle East unirrigated, can be coppiced and are nitrogen fixers, would include:

  • Acacia saligna
  • Acacia (Senegalia) senegal
  • Acacia tortilis
  • Albizia lebbeck
  • Leucaena leucocephala
  • Pithocellobium dulce
  • Prosopis cineraria (possibly)
  • Prosopis juliflora
  • Sesbania sesban
Strong epicormic growth is ideal for coppice. Prosopis juliflora

Other species, coppicable but non-nitrogen fixing, would include:

  • Azadirachta indica (assumed from observed regrowth)
  • Conocarpus lancifolius (assumed from observed regrowth)
  • Eucalyptus sp.
  • Ficus sp.
  • Moringa oleifera
  • Tamarix sp.
  • Ziziphus spina-christi
Regrowth from cut branch of Tamarix aphylla
Ziziphus spina-christi, showing classic epicormic growth

There will be many other species that could fit these lists, but it’s a start. Many ornamental trees, such as Millingtonia and even Delonix show tendencies to throw up epicormic growth from wounds and therefore, in theory might coppice, but I am concentrating on trees which can do this without irrigation.

It’s important to say right here that this shouldn’t ever be designed as a monoculture; there is sound ecological reasons to to maximise the diversity of a planting. Naturally, you wouldn’t use everything, for conditions will suit some better than others for any given site. Nor would you coppice everything all at the same time. Staggering the harvest evens out the work-flow but more importantly, creates communities of plants at different stages of growth. The “edge zones” are always where the greatest biodiversity occurs, for you get the overlap of differing ecologies. Whilst each species will have it’s own regrowth rate and optimum cutting cycle, this can also be varied, according to the use of the product.

Of course, there is a problem, for many of these species are incredibly thorny, which is a real issue for those carrying out the coppice-work. Young vigorous growth also tends to have the most vicious thorns! On a larger scale, it may be possible to use forestry-style Forwarder tractor-trailer units to collect the brush and load it directly into the chipping machine hopper, without human intervention. Someone’s still got to cut it and do initial handling though.

Ziziphus stump, showing strong epicormic regrowth

So how do we express this idea, of coppiced woodlands, arid-land style? it would depend on context but there are several approaches we could take. On a large scale, machine operated (as mentioned above), we would have to do traditional layouts with alleys or rows, firebreaks etc. Mixed planting though, would be preferable although strips of one species are possible. If kept narrow, with different species to either side, the effect ecologically would be similar to mixed planting.

In smaller areas, or where human interaction is intended, then these could take the form of the mixed, seeded landscapes that I discussed in my previous article. In other words, we can combine the function with the elements of aesthetics and ecological diversity. Not to mention desert reclamation. Remember, all this is proposed as unirrigated land. The verges along main roads are a prime candidate, instead of over-manicured lawns and hedges that you see at many junctions.

My next article will discuss design, the knowledge and training needed for the creation of such landscapes. I believe we could transform the landscapes of the Middle East, without the intensive irrigation that is required by conventional approach.


First and second articles in this series:

Posted in Abu Dhabi, Adaptive Planting, Agroforestry, Brownfield regeneration, Climate Change, Coppice, Ecosystem Services, Environment, landscapes, Middle-East, Natural Landscapes, Regenerative Planting, Sustainability, Trees, Treescapes, Uncategorized, woodland Tagged with: , , , , , , , , , ,

March 13th, 2020 by Mark Laurence

In part one of this four-part series, I discussed the colonization of brownfield sites in the UAE’s cities with a range of trees and shrubs – almost all of them “exotic invasive” species.  I argued that these could be forming the basis of new, adapted ecologies.  To revise those arguments, please the link at the end of this article.  The next question is, once we accept this premise, how do we create these new ecologies as a conscious expression of our own adaptation to climate change?

A self-seeded landscape, Abu Dhabi

First, let’s understand that we need these landscapes to be unirrigated.  Why? Well, in the Middle East especially, water is a precious resource and expensive; the UAE is particularly bad, with a per capita use of 550 litres/day.  So with landscaping, let’s keep the irrigation for the urban centres, parks and gardens.  If we just focused, for example, on all the miles of roads and interchanges between Dubai, Abu Dhabi and Al Ain that are irrigated, and imagine these replaced with unirrigated greenery, the water saving from this alone would be massive.  Yet that is an immense challenge, for as soon as you plant something in a desert, you must water it.

If we want a vibrant plant ecology, then we also need a vibrant soil ecology, something that conventional landscaping ignores completely

I think this is the key, that planting in such a climate rarely establishes without help, whereas seeds can.  What we need therefore, is a methodology of establishing and maintaining, seeded landscapes.

Flowers of Prosopis juliflora attracts bees and insects

It is true that in a scenario where we are consciously creating an unirrigated landscape, we would want to greatly increase the odds of establishment.  In this respect, much detailed assessment would need to be given to soil amelioration.  If we want a vibrant plant ecology, then we also need a vibrant soil ecology; this is crucial and something that conventional landscaping ignores completely. A large part of this would be creating contour swales across the site to capture whatever rain falls and to ensure it soaks into the soil. Even a small change of elevation can change the conditions and so the ecology that can grow there.

Once we’ve created swales, can we build a healthy soil, rich with microbial activity and naturally water retentive in such an arid climate?  I think we can, but we must first change our thinking from one of assisting landscapes with external inputs (irrigation) to that of creating self-sufficient ones, with cyclical, living, self-sustaining ecologies. Soil becomes the vital kingpin in all this, not just an anchorage medium for plants. 

Native soils need to be worked with, not replaced.  They can be moderated, made more moisture retaining, but basics like salinity and pH will always dictate plant choice.  First and most important, is to increase the soil’s water retention capacity. There are a number of ways to do this, involving additives which may incorporate clays, granules or other water-holding mediums and we know that when used in irrigated landscapes, they can reduce water demand by up to 50%. Given that an unirrigated landscape might have periods of time when it is extremely dry, we need a medium that doesn’t become hydrophobic if it does dry out and that will react swiftly to absorb water when it does arrive.

Sesbania sesban, a nitrogen-fixing shrub

We can also inoculate the soil with mycorrhizal fungi cultured from local, healthy environments to enhance soil micro-ecology; there is little point in importing this from another part of the world, as the relevant strains of microbes are likely absent.  Microbes and bacteria are the essence of good soil. Many of the plants used will be nitrogen-fixers, and so live in a symbiosis with certain bacteria. They also make nitrogen available to other species, as cycles of life and decay build up.

Organic matter is essential and the best innoculator of bacteria and fungi, but it can be the most problematic element as it is in short supply. One aspect of the practical usage of such landscapes, and a part of the long-term management, can be the coppicing of trees and shrubs for biomass to make compost. Organic matter tends to oxidise if conditions are not conducive, so we need to get things right, but I’m sure that even desert soils can sequester carbon, given the right conditions.

We would need to mix these various elements into the soil to the appropriate depth, perhaps a metre, probably by air injection, and possibly to different depths for the different mediums. Soil preparation becomes the most major, one-time investment in the land but will pay back endlessly over the lifetime of the landscape.

Black Carpenter bees on Leucaena leucocephala

Once the preparation is done we have to seed the land, when conditions are optimal (not when contract deadlines require); this would have to be timed after rain, if possible.  Otherwise, I would give the land a soaking, with our soil amendments helping to retain the moisture, then apply seed, in a variety of ways, possibly by hydra-seeding.  Finally, a locally-sourced stone mulch should be placed over all, to again help retain moisture, but not too thick to inhibit germination.  This would be the entirety of the preparation and installation work. 

Next is the nurturing stage, followed by on-going management and maintenance; this will be very different from a conventional landscape, but no less intensive, at least for the first few years. It may be beneficial to give additional watering to aid plants as they germinate and establish, but this must be done with care, or seedlings could be washed away. We would need to give enough to ensure success, but no more.

Once established, these plants would grow at whatever speed the conditions allowed and a new landscape would emerge over time. Thinning out and reseeding of failed areas would be the main work, acts of stewardship rather than maintenance. Prunings shredded and spread as mulch, soils fit to support life, insects, animals and birds would soon make this place their home. The result would be a slow and genuine landscape uplift into the realms of a new and adapted ecology.


How we design such landscapes, choose which plants to use, obtain the seed and know how to maintain them, is the subject of the next article.

The first article of this four part series is:

Posted in Abu Dhabi, Adaptive Planting, Brownfield regeneration, Climate Change, Dry Garden, Dubai, UAE, Landscape Futurism, landscapes, Middle-East, Natural Landscapes, Planting Design, Regenerative Planting, Sustainability, Trees Tagged with: , , , , , , , , , , ,

Natural regeneration on a brownfield site Dubai
March 8th, 2020 by Mark Laurence

This is the first of a four-part article, links to the others are at the end.

These articles are all a part of the same thought progress, which has been brewing for some time and started with an article I wrote two years ago, in March 2018.  I think this is an important subject, and hope that you’ll agree and read them…

Whenever I am in the UAE, I find time to visit various parks and gardens; on my latest trip to Dubai (February 2020), I went to see Al Ittihad park, a well-kept secret in the spine of the Palm Jumeirah, underneath the monorail, which was designed using native and naturalized plants of the UAE.  It also, the blurb said, promised everything was labeled, so ideal for a crash course in local flora.  The park was interesting but unfortunately all the labels had gone, and it was being maintained in the manner of all landscapes; incorrectly, especially so for native planting.

Of equal or greater value, however, are simple walks around the back-streets and suburbs of a city and I find empty brownfield sites, awaiting development, often offer the best insights as to what will actually grow in an arid region, if things are left to their own devices.  It’s more than you’d think, and it’s not all native.  I’ve written about this before, in this article and I’m building here on my earlier observations.

Video of brownfiled site in Dubai showing natural regeneration

The world is gripped in fear of biological invasion, currently of Coronovirus but I’m talking here of the floral kind.  Globally, there is a growing passion for conservation, restoration of what was, of what we think of as native and right.  We seem to think that in taking this approach, we are setting right the wrongs we have done; nothing could be further from the truth. Fortunately, Nature doesn’t share that passion and is busy dispersing its flora and fauna around the place, wherever and however it can.  That it uses humans as vectors for that dispersal, is obvious, if you just look upon it from a wider perspective.  Perhaps Nature knows something that we humans are trying hard to ignore; that the climate is changing, the rules of life are shifting, that ecologies need to adapt to the new conditions. 

Leucaena leucocephala

I think we humans are both arrogant and ignorant when we say, “that plant doesn’t belong here, we must get rid of it”.  Plants that arrive and succeed are the pioneers of a new, adapting ecology; yes, they are aggressive, yes, they grow without restraint and colonize -usually – disturbed ground, yes, some make monocultures.  Like all pioneer species they are fast, competitive and relatively short-lived.  But they establish life and the conditions for the next species of successional plants to come along.  All parts of the world are, or soon will be, under such huge environmental stress that we must actively embrace change and nurture these new ecologies. We cannot live in a world without complex ecology, nor can we hold back the change, so we have to go with it.

Prosopis juliflora

To come back to my brownfield sites, on my previous article, linked above, I encountered the following trees growing on a brownfield site in Abu Dhabi:

  • Prosopis juliflora
  • Ficus benghalensis
  • Eucalyptus camaldulensis
  • Conocarpus lancifolius
  • Washingtonia robusta

From recent observations in Dubai I can add the following trees:

  • Azadirachta indica
  • Leucaena leucocephala
  • Plus the Prosopis and Ficus from the above list.
Azadirachta indica

From the looks of it, this site was more recently cleared than the Abu Dhabi one, and trees appeared to be no more than 2-3 years old.

There were also a range of groundcovers and grasses growing; I haven’t been able to ID them all, but some I saw included:

  • Aizoon canariense
  • Heliotropium bacciferum
  • Salsola collina
  • Tribulus terrestris
  • Chloris virgata
  • Panicum turgidum
Tribulus terrestris

Such plants are equally important in building new ecologies, and a big part of the whole.  There are of course, a huge range of native or adaptive plants not represented here, which would nonetheless grow, given the chance.

These observations might be interesting, but how useful are they? If we think of conventional, irrigated landscapes, perhaps not very useful at all; we know and use many of the trees already.  Where this becomes interesting, is in that they self-seed and establish without any human intervention.  If we could master the art of this, then such landscapes we would nurture and manage, with occasional thinning, removals, perhaps some sucessional seeding or planting. Imagine this on a large scale, in peri-urban locations, alongside roads, at intersections, instead of the over-watered ornamentation we see now throughout the UAE.  We then save the ornate for the urban parks, streets and gardens.

Aizoon canariense

Could this be the basis for a new approach to creating landscapes and if so, how would we do it?

This is the subject of the next article:

Posted in Abu Dhabi, Adaptive Planting, Brownfield regeneration, Climate Change, Dubai, UAE, Environment, landscapes, Middle-East, Natural Landscapes, Regenerative Planting, Sustainability, Trees, Treescapes Tagged with: , , , , , , , , , , ,

Grassess in Abu Dhabi
November 29th, 2019 by Mark Laurence

The other side of work I undertake in the Middle-East region (other than tree consultancy) is planting design, for creating new landscapes always brings me a special joy.  When they are in public spaces, I love the chance it gives to interact (albeit remotely) with many people in place, over time and hopefully, enhance their enjoyment of that place.  In the public realm, what that place is, is being questioned and challenged in the light of urbanisation and climate change.  Ecology and environment are driving design as never before.

I am about to start working on a collaborative project in Saudi Arabia.  It will involve the specification of many trees, shrubs and groundcovers and  I get to find out just how many locally-sourced big specimens I can find that are of acceptable quality.  Much of this will come down to the application of formative pruning in the nursery and I’ll be on the lookout for the best available in the region.  I suspect I’ll be sourcing a lot from neigbouring UAE, simply because of familiarity of sources.  Quality remains a challenge, though.


Excess Irrigation in a Dubai housing area

My most pressing concern I have is how to improve on irrigation  techniques, which are traditionally massed  surface drip lines onto marginally improved sand.  This is inefficient and wasteful and I shall be looking at the use of moisture retention mediums and sub-surface irrigation.  I believe most watering of landscapes in arid climates could be cut by half, just by more efficient application and retention, in the right place.  The picture above shows  typical wastage in a Dubai suburban landscape.

Whilst urban planting requires urban plants, I will also be looking at the use of more climate-adaptive species, which I think is important in an era of climate crisis; the Middle-East is going to struggle to cope with every degree of temperature increase.  The use of more desert-adapted planting is not new, and not applicable everywhere but I believe there is much scope for experimentation and new thinking.

The power and the beauty

For me, planting design is about building communities, layering types of plants together in harmonious associations that fit.  I don’t mind grouping plants together that come from different geographical regions, but they have to come from a similar ecological niche.  Such design is so much more than just nice foliage contrasts and I believe the results can be subtle, but profound.

Landscape must, of course, fit our purpose but I believe we tend to pursue this end to the exclusion of everything else.  Nature is the basis of landscape, and so too is ecology, ecosystem and planet.  We should not divorce our landscapes from this reality; rather, they should always seek to remind us of these connections.  So yes, in town centres and urban streets, we have our eco-bling landscapes; vibrant places, exotic, heady, purfumed, exciting.  Nature at it’s most unbelievably flamboyant (cue pic: delonix, the flamboyant tree).  Elsewhere, we need more grounded landscapes, more real, more connected to place.


Delonix regia, the flamboyant tree

I love this tree, it is everything I have described above, pure eco-bling.  Yet it is not appropriate everywhere and because it has become a part of the standard landscape palette, I belive it is overused, and used in places where other species would be more appropriate.   I think there are many trees and shrubs that could be used in the region that haven’t been tried yet, from East Africa, for example.  The climate there may be more equatorial and more varied but it is not so remote or different as that of some exotics imported from sub-tropical climates (the Delonix mentioned above is from Madagascar, again not too dissimilar).

I think planting design in the Middle-East faces a whole new range of challenges and opportunities.  The changing climate will force new thinking, to match the new development and the new understanding that is emerging of our intimate relationship with nature.  I’m hoping to contribute towards that new expression and understanding.

Posted in Adaptive Planting, Biophilia, Climate Change, Design, Dry Garden, Dubai, UAE, Environment, Garden Design, Middle-East, Natural Landscapes, Planting Design, Regenerative Planting, Sustainability, Trees, Urban Landscapes Tagged with: , , , , , , , ,

Adaptive landscape design
April 25th, 2019 by Mark Laurence

The world is finally, at the last minute, waking up to the impending effects and consequences of climate change. In the scramble to work out what we must do (apart from the obvious cessation of burning fossil fuels), one thing, one factor is looming large: we need to put carbon back into the soil, where it can be stored indefinitely, and we need to reforest the Earth. Much of this is in the agricultural realm but there is a huge amount that can – and must – be done within the landscape and horticultural sectors.


Horticulture has a MISSION, it just doesn’t realise it yet

At the centre of this is good soil husbandry, something that we have largely forgotten about. Modern agriculture bypasses all need of soil health by chemically feeding crops; no need for microbes, nutrients, humus, mycelium or earthworms. Chemical fertilisers and herbicides bypass the lot. Most of our soils now are depleted to the point of useless by chemical farming, exacerbated by the tradition of ploughing, which causes erosion from rain and enables much of the soil carbon to move back into the atmosphere.

So whilst we need current global models of food production to transform into regenerative agriculture and agroforestry, we also need to look at our urban landscapes and gardens, and create a new design ethic, a new paradigm, even. I can’t deal here with agriculture but I have been thinking long and hard on what the landscape and horticulture trades need to do; fortunately, I believe there is a lot that we can do.

We need to envelope our existing horticulture trade within ecology, to create an “environmental horticulture” You could also call it ecological, resilience or regenerative horticulture. We (those of us in the trade) know that as a profession, the training of both horticulture (growing) and landscape (doing) are in decline. Horticultural colleges have shrinking budgets and often get the less ambitious or capable students; after all, who is inspired by the prospect of strimming verges or hedge-trimming another unloved carparking lot? Yet last year’s report by the Ornamental Horticulture Roundtable Group valued horticulture at £24.2 billion in GDP in 2017. That’s not inconsequential, yet it goes unrecognised. Fortunately, there is a way to make it much more enticing to prospective students.

Horticulture has a MISSION, it just doesn’t realise it yet. That mission is to adapt our urban landscapes and gardens to cope with climate change, to mitigate temperatures, water flows, to grow biomass and regenerate soils back to health. Healthy soil is the foundation of life, of all life, including our own. Good soil holds fertility, water and carbon. Yet who amongst us now knows much of soil science? Who designs landscapes as ecologies, as “novel ecosystems”, who chooses plants because they have these abilities, not just for pretty flowers? Who designs plantings for their biomass harvest, for creating mulches to feed the soil?

In this respect, I don’t believe it’s necessary – or right, in fact – to work with native plants only. What is native? What was native? What was here 11,700 years ago when the last glacial period ended and the glaciers retreated? Flora and fauna move around the globe all the time, they are opportunistic, not fixed permanently into some tightly integrated ecosystem. We know there is no “ecological climax”, no ultimate ecosystem for any given place. As temperatures rise, climate zones are now shifting away from the equator quicker than Nature can keep up, although it’ll get there eventually. Maybe we help nature, rather than interfere when we bring in exotic plants that naturalise. Maybe those plants are the start of new ecologies that will adapt to the rapid changes that this climate emergency is bringing us. If plants do well, we need to understand how to enhance and build new ecologies with them. This is how we adapt, how we survive and how we rectify the damage we have done as a species; not by returning to some pristine “before” (which doesn’t exist) but by assisting Nature to heal and adapt. The Earth will do this all by itself, and has done so many times. It doesn’t mind if it takes thousands, or even hundreds of thousands of years to adapt. But we do; we can’t wait that long.

So horticulture needs to stop growing pansies in peat with unrecyclable plastic trays and start sorting out which plants really matter for our future; which ones contribute to new and existing ecologies, which ones are good for biomass, which ones contribute to soil health, which ones give us ecosystem services. We should not enhance one environment at the expense of another.

What’s needed is a very-near future profession of trained eco-warriors, soil saviours, tree patriots and landscape lovers. It needs people who understand soil, who know how to design and use sensors, data and the internet of things, people who see what’s coming and how to mitigate and reverse negative effects, people who really know how to design and install green infrastructure and future automated robotic maintenance systems. Our landscapes can grow food in amongst all the beauty, with urban food forests. We need new knowledge built on old and we need passion, commitment. A wise government would fund this for the returns will be numerous.

This is the enlightenment, that out of dire stress and trouble, we could really learn how to value, connect with and protect this crazy, beautiful world within which we live. Or we can do nothing and watch it all go to hell. I know which I’ll be doing.

Posted in Adaptive Planting, Biophilia, Climate Change, Design, Ecosystem Services, Edible Planting, Environment, Garden Design, green roof, Green walls, Landscape Futurism, landscapes, living walls, Natural Landscapes, Planting Design, rain gardens, Regenerative Planting, Smart Cities, Sustainability, Trees, Urban Landscapes, Vertical Greening Tagged with: , , , , , , , , , ,

The dry garden - created over the remains of an old driveway
January 24th, 2019 by Mark Laurence

The emergence of the idea of resilient planting is a response to a number of different pressures which all have one underlying cause – climate change. Whatever the cause – and I’ll get on to that later – I see it as the most exciting change to the way we design our gardens and landscapes.

Last year we had one of the hottest summers ever recorded and it serves to heighten awareness of the vulnerability of some plants and garden styles to the increasingly erratic climate we are dealing with in the UK. We seem to swing from one extreme to the other, and this is only likely to get worse. I’ve witnessed a number of stressed plants in my own garden but feel relieved that most have thrived throughout the heat, without any watering on my part. this is down to soil, drainage, micro-climate and above all, plant choice.

Ballota pseudodictamus, a Mediterranean sub-shrub with grey, felted leaves, loved by bees.

Ballota pseudodictamnus, a Mediterranean sub-shrub with grey, felted leaves, loved by bees.

We garden on an alluvial coastal plain, and are fortunate to have a very free-draining soil overlying a clay substrate.  It gives us fertile soil, great drainage and a moist sub-strata within the reach of most plants (many areas around us are of much heavier clay).  A large section of our front area used to be a paddock with a rubble driveway and this now forms the basis of much of my dry garden.  Some rubble was removed and topsoil added, but a lot of areas are still rubble-strewn, not unlike some rocky soils.  The down side of all this is super-fertility and a soil filled with weed seeds, bindweed and couch.  To be honest, I’d have preferred a poorer soil.

When thinking of resilient planting, we have to match our plant type to the environment; we also have to think, long-term, of how our environment might change in the coming years.  This is not so important when dealing with short-lived plants such as herbs, sub-shrubs and perennials, but is super important when dealing with long-term structures, especially trees. This is doubly true when we look at the potentially disastrous effects of imported pests and diseases that we are having to content with.  Climate change, especially milder winters, mean that exotic pests are happily making a home here and wreaking an unintentional devastation to trees such as our native ash and even oak.

Phlomis russeliana, after flowering. The stem leaves have since dropped, leaving an brown, architectural structure.

Phlomis russeliana, after flowering. The stem leaves have since dropped, leaving a brown, architectural structure.

No-one can say exactly which way our climate will go as the world hots up; we know we (in the UK) will always be maritime, because that can’t change, but as the Jet stream (wind currents) varies and the Gulf stream (water currents) weakens, we don’t really know what kind of climate we’ll end up with.  We can only plan for extremes, and select our planting choices with that in mind.  In this respect, the “new perennial” or “naturalistic” planting isn’t necessarily going to be the toughest choice as they come from a continental climate which generally have hot summers and very cold winters.  Prairie plants tend to get out-competed here with our mild winters and grasses and forbs that can grow all year round, given mild conditions. The aforementioned fertility (at least in my garden’s case) also doesn’t help as wildflower meadows/prairies tend to have poor soil which helps keep the grasses from assuming dominance. During the heat-stressed weeks, I noticed that where I have perennials like Echinacea and Veronicastrum (in moister areas than the dry garden), they suffered from the lack of water. which resulted in the Veronacastrum flower spikes looking stunted.  for more moisture-demanding planting, sub-surface irrigation using harvested rainwater might become a necessity.

To my mind though, if you need irrigation you’re working with the wrong plant-types, trying to grow plants that can’t naturally cope with the conditions that predominate.  Save your water for the newly planted and the vegetable plot and for this, consider rainwater harvesting, rather than mains.  When selecting plants, see what grows well, both of native and non-native origins and build adaptive micro-ecologies.  Our climate is changing faster than the current ecosystems and ecologies can cope with and we need to do whatever we can to build new planting that is of maximum benefit to local wildlife, as well as ourselves.

It’s an exciting time to be a gardener, for there is no place now for the self-indulgence and nature-control-freakishness of the past. What there is a the possibility of co-creating new ecologies that adapt to changes, halt decline and make our local wildlife vibrant and healthy.

Along the way, we can create the most stunning of gardens!

Posted in Adaptive Planting, Biophilia, Climate Change, Dry Garden, Ecosystem Services, Environment, Garden Design, landscapes, My Garden, Natural Landscapes, Planting Design, Regenerative Planting, Sustainability Tagged with: , , , , , , ,

A natural Xeriscape
March 23rd, 2018 by Mark Laurence

A problem, or an opportunity for a new landscape paradigm?

I was recently working on a tree project in Abu Dhabi when I came across a derelict site which intrigued me with it’s range of exotic self-seeded, non-native plants.  The site was next to the Corniche and sandwiched between the Formal Park, my hotel and Capital Gardens.  It struck me initially as the perfect basis of a xeriscape, as all the plants (mostly trees) were thriving without irrigation.  On closer inspection and identification of the species involved, things got more complex and raised a lot of potentially conflicting thoughts and issues.

A natural Xeriscape

A natural Xeriscape

The site was clearly awaiting redevelopment and the plant invasion was opportunistic.  Nothing that I could identify was native, yet all seemed happy there.  When you see the list, you might understand why.  Amongst the plastic and litter I identified:

  • Prosopis juliflora
  • Ficus benghalensis
  • Eucalyptus camaldulensis
  • Conocarpus lancifolius
  • Washingtonia robusta

Of those plants, the P. juliflora was the most robust and when you look at its reputation, that is of no surprise. It was of landscape scale, lush and greener than anything in the adjacent parks.  It’s form, leaf, flowers and seeds are attractive from a landscape perspective.  Yet this is undoubtedly the most controversial plant on this list – some would say alarming.  A Native of arid zones in central and South America, this was, like so many others, introduced into the UAE in the 70’s as a forestry plant.  Lauded as something of a super-crop tree, it is tenacious, vigorous, provides fuelwood and stock-feed in the form of abundant seeds.  The latter, it turned out, were a problem in that they are spread by cattle and are extremely aggressive.  Plants also regenerate rapidly from the roots when cut back and they reputedly produce biochemical inhibitors to suppress competition (allelopathy).  With no natural competitors in the UAE and roots that can descend 50m in search of water, they out-compete native flora, even their cousin, Prosopis cineraria (ghaf tree).

Prosopis juliflora flowers

Prosopis juliflora flowers

P. juliflora has a low, mounding habit, attractive from a landscape point of view.

P. juliflora has a low, mounding habit, attractive from a landscape point of view.

Also on the site were a number of Banyan trees, Ficus benghalensis, which seemed to be growing happily. Another tough survivor, it should be borne in mind that the water table here is likely only a metre or so below ground, although it will have a high saline content.

Ficus benghalensis

Ficus benghalensis

Then there was Eucalyptus camaldulensis , another forestry/amenity introduction of the 70’s, also known and now generally avoided for its aggressive roots, yet here looking beautiful with its grey, lanceolate foliage.  This was the tallest tree on site.

Eucalyptus glaucescens, showing adult foliage

Eucalyptus camaldulensis , showing adult foliage

Of course, there was the ubiquitous Conocarpus lancifolius, widely planted still yet also recognised and a danger to any nearby drains, and on it’s way out in popular use.  Except it does make such a good tall hedge, and it has a much nearer native origin, coming from Somalia, Djibouti and Yemen.  I’m not sure that the UAE landscape industry is ready to ditch it just yet.

Conocarpus lancifolius

Conocarpus lancifolius

There was even a palm, Washingtonia robusta, self-seeded around the place.  Much of it was to be found growing underneath the canopy of the P. juliflora, so that at least is not put off by any allelopathic biochemicals from the Prosopis.

Washingtonia robusta

Washingtonia robusta

Unknown Legume

I believe this legume is Sesbania sesban, more commonly seen with yellow flowers.Rose-ringed Parakeet Rose-ringed Parakeet

Inhabiting, or at least visiting the site, was a Rose-winged Parakeet.  Another exotic invasive with beautiful form but aggressive tendencies; it seemed appropriate to the moment, somehow.

What does this mean for future landscapes and ecology?

From a conventional ecology point of view, these plants are all threats, and the threats probably outweigh their usefulness.  So why am I even talking about this?  Clearly, the move towards more naturalistic landscapes draws heavily on native species and would shun all of these species.

Except we have climate change.

Climate change is the elephant in the room, when it comes to ecology, in fact when it comes to sustainability generally and a livable planet overall.  That we have already moved beyond vital tipping points is highly likely; that climate zones are moving away from the equator at a rate too fast for nature to adapt is a fact.  Flora and even some fauna just can’t move regions that quickly.  They will adapt, eventually; but those that are rare, specialist and struggle with change, will die.  The tougher generalists will adapt and survive.  Nature will build a new ecology to reflect the new reality, and it doesn’t mind if it takes a few thousand years to do so.  Only we humans mind and so, if we are to survive, we must adapt our environments to fit the new reality.  It is a sad fact that many cherished plants will eventually die out or move zones.  In the UK, I dread losing our native oaks (I view these as our ghaf tree equivalent), yet we may get Mediterranean species to replace them, such as holm and cork oak.

If you are already positioned in the arid equatorial zones then you have precious few plants that will form your new ecologies and landscapes.  Perhaps the plants I have described above will be UAE naturalized-natives in 100 years’ time and the ghaf and sidr may be gone, or diminished, or moved north.  I hope not, but before we spend vast fortunes on eradication and control of non-natives, we should look to the future.  These aggressive invaders may just form the landscape of our children; I know I’d rather live with a landscape, than none at all.  If there is no landscape, there is no life.  They may, in fact, be here to save us.

Once we grasp this fact, we can look at building new landscapes to suit our changing environments. I’ve written about this before and you can read the articles listed below.  We must be vastly more holistic in our thinking in order to do this and broaden our horizons to understand the new future.  Technology will help us to monitor, collect data and produce working strategies.  Robotics and drones will help manage and control plant communities.  Alongside that, we need a vastly better understanding of soils, microflora and fauna, for the bit of nature that we see is just, literally, the tip of the iceberg.  The selection of tree and shrub species for adaptation is easy, we get this wrong when we don’t deal in whole context thinking eg. only thinking of forestry or ornamental benefits.

The challenge ahead is huge but in a weird way, exciting; it will challenge the human race to grow.  There’s a whole new science to develop and we’d best get on with it.

Update

According to Google, the site has been cleared some time in 2019:

Site cleared of vegetation in 2019

But seeds will be waiting for future opportunity!

Other articles by ML that relate to this topic:

Brownfield site natural regeneration in the UAE

Creating climate-adapted landscapes in the Middle East

Coppiced treescapes for the Middle East

Older articles:

https://www.marklaurence.com/wp/trans-migrational-landscapes-a-survival-strategy-for-the-world/

https://www.marklaurence.com/wp/why-we-can-and-must-create-new-adaptive-ecologies/

https://www.marklaurence.com/wp/trees-climate-change-our-landscapes/

Posted in Arboriculture, Climate Change, Dubai, UAE, Ecosystem Services, Environment, landscapes, Middle-East, Natural Landscapes, Regenerative Planting, Sustainability, Trees Tagged with: , , , , , , , , , , , , , ,

July 10th, 2016 by Mark Laurence

This review first appeared in Thinking Gardens in February 2016.


This book represents a new wave of thinking about “natural” planting that has been emerging in recent years; actually it has been developing for the last thirty or more years but like all new things, they tend to follow an exponential growth curve. I’d say that right now we’re near the base of the steep upward bit with this one. Left unchecked, exponential growth tends to end in collapse but this idea deserves to stay the course. To do that it has to translate from a style into a design language and that’s what this book is really about.

This is a very US-centric book, unsurprising since Thomas Rainer is from Alabama and Claudia West, though of East German origin, lives in the US. I would have liked her influence to have given the book a more European feel; it would have been richer for it and more globally relevant.

The book has already been reviewed on TG by James Golden but although I’ve read this I’m not referring to it, save for one point. Needless to say, that review is also very US-centric; my purpose is to give a more UK/European viewpoint.

The thinking in this book is very design-led, in which the authors refer to landscape archetypes, which I think is very useful. However, they only select three – grasslands, wood and shrubland and forest. Given the vastness and variety of American climate types (which has just about everything), I’m surprised they didn’t mention desert landscapes, arid-mountainous or Mediterranean (as in Californian coastal regions); I suspect they have simply not worked with these climates, yet to omit them from a listing of archetypes is limiting. It is clear too, that their interest lies mostly in the grassland or prairie archetype.

Desert Archetype

There are many archetypes other than the three mentioned in this book. Desert near Dubai, UAE.

Referring back to the JG review, he wanted to add another archetype, Edges. I would argue that the wood and shrubland archetype is an edge, or rather a transition. Only in farmer’s fields do we have an edge as such. I would think of these archetypes as parts of a sine wave, one transitioning into another as climate and topography dictate. This sine wave also rolls around the globe over time, one archetype superseding another in any given place. Remember that the Sahara desert was woodland just 10,000 years ago, when we emerged from the last ice-age. This fits with the theory that there is no such thing as an ecological climax.

Another interesting thing to come out of this book is the idea of “designed plant communities”. You could say that any grouping of plants together is a designed community but the context they use of grouping plants by habitat-type rather than just their visual look is refreshing. This makes good sense, provided that such a designed grouping is appropriate within its wider environmental context. Taken to its logical extreme, however, you end up with native plants only.

What may be harder to work out is how much of this philosophy fits into a garden. Even the largest garden can’t fit in a whole wood, let alone a prairie, so of course, we must work by inference. This aspect of things is not really discussed in the book and most of the pictures are of large gardens in amazing settings; domains of the lucky few who we landscape designers occasionally get to work for. Yet for the majority of small garden owners, instruction for the adaptation of these principles is missing.

Millenium Park, chicago

The Lurie Garden, Millennium Park, Chicago by Piet Oudolf exemplifies modern Naturalistic planting. This is large ribbons or drifts of plants rather than the species intermingling favoured in this book

Millennium Park, Chichgo

The same garden in November; form is held in the stems and shapes of the seedheads but use of some woody plants might add more winter form?

I feel that the book only really looks at one archetype, that of New Perennial/Prairie style gardens and there is a big focus on this at the moment. I might compare this book with Oudolf & Kingsburys “Planting, a New Perspective”. That book, whilst not getting down to the archetypal design level, is more European in focus, so possibly a good companion read. Yet it too, mostly deals with perennial-based planting, as you would expect from these gents. The work of Nigel Dunnett and James Hitchmough comes to mind too. The fast-changing essence of many of the plant species used means that these perennial plantings are subject to rapid change, even degradation, over time as some of the most desirable and favourite species are so short-lived (Achillea and Echinacea for example).

I think the Wood and Shrubland archetype is the most likely to resonate with those seeking to create a garden, yet the ones of great importance to me, in a European and specifically coastal Southern England context, is that of the unmentioned Mediterranean or Arid-Mountainous archetypes. Whilst some areas of the Mediterranean clearly fit the Wood & Shrubland archetype (ie broadleaf and evergreen woodlands and Maquis), others such as Garigue, Salt Marshes and Rocky Shorelines, do not. I think this range and essence adds up to its own unique archetype. Arid-Mountainous too is quite distinct (although again with areas that fall into the realm of other archetypes), yet gives us wonderful, tough plants like Perovskia. The Dutch biologist Brian Kabbes has done much to inspire and educate us with his exploration of plants in Kyrgyzstan.

Perovskia arbrotanoides

Perovskia arbrotanoides growing wild in the mountains of Kyrgyzstan. Photo by Brian Kabbes

 

To me, one of the biggest drivers in creating naturalistic planting communities has always been about resilience. To my mind, planting should survive without irrigation, so low water-use plants are attractive. I can’t think of a single garden in the UK that couldn’t survive without irrigation, the desire to use pop-up sprinklers is ridiculous and surely industry-driven. Climate is changing now beyond speeds that Nature can shift plants and ecologies around the globe, so it is something we humans must do if we want a future landscape of any description (oh, and for our own survival). So we have to transmigrate landscapes from one continent to another to keep pace; yes, with all the risks that entails when introducing new species (and it would not be just plants we’d have to relocate). So learning about plant communities and how to build them is a vital skill which this book begins to explore, yet could have gone much further in instructing us on.

Mediterranean Archetype

This coastal garden I designed in Southern UK loosely mimics the Mediterranean archetype, and uses a full range of grasses, perennials, sub-shrubs, herbs, shrubs and trees.

 

In the European context then, archetypes other than grassland/prairie might be more useful and translatable into a garden context. That this book has not covered these is not really surprising but it is a mistake to think that the new language of resilient/natural/sustainable landscapes is dominated by perennials and grasses. This aspect is possibly a trend within the underlying drive for a natural interpretation.

A European version of this book is needed, which could perhaps take it to the next level of design language development. In this respect, inspiration can be drawn from another book, “A Pattern Language” by Christopher Alexander, which although about architecture and space, is also about soul, spirit, context and community, realised through the use of a language of patterns. In a very real way, “Planting in a Post-Wild World” attempts to create an archetype-based design language and is a valuable contribution to that. We just need the language to be global, or to see this book as a regionalised attempt to cross boundaries and develop new thinking.

This is an important book and I recommend it; for all its limitations it shows the way to develop landscapes that are truly new and profound.

Posted in Book Review, Design, Environment, landscapes, Natural Landscapes, Regenerative Planting Tagged with: , , , , , , , ,

hazel pruning methods
January 9th, 2016 by Mark Laurence

In my previous post I talked about a regenerative planting methodology for urban landscapes, in which I suggested you would manage, rather than maintain your planting areas. So how exactly do you you do this? Both involve work and the difference is a subtle but important one, in both attitude and application. Think urban forester rather than garden pruner. The picture above illustrates this perfectly, so let me explain.

It shows two hazels in my garden, both planted as young bare-root trees in the winter of 07/08. The one on the left was coppiced down to the ground in the winter of 12/13, the other has been pruned to keep a structure of older wood, with all suckering growth removed annually. What is the difference? The coppiced hazel has been less work overall and has not been touched since it was coppiced, the pruned tree has been pruned annually, which was not great amount of work but this is just one tree. If there were a hundred, it would be a different matter. The main difference is that the pruned tree has catkins, the coppiced tree does not, but I think this is a difference of genetics, rather than pruning technique, as they have always been like that. The shape of the pruned tree is also wider in its spread and will become gnarled as it gets older.

So in terms of management, if you go the coppice route you do nothing much to the trees except coppice them every 4-5 years. I would suggest that 50% of the trees are coppiced so that not all structure is removed at once. Notice that the growth of the coppiced hazel is straighter, making for a productive yield of canes and poles that can be used in the local community. Other trees that can be coppiced include sweet chestnut, lime, alder, ash, willow and hornbeam. Birch and oak will coppice, but from young trees only. Willows and dogwoods grown as bushes for their winter colour can be coppiced or “copparded” (inbetween coppice and pollard) to around 300-600mm every two years to keep the winter stem colours strong.

Salix elaeagnos

Salix elaeagnos (foreground)

By adopting such techniques in our larger masses of urban street planting and parks, we would deliver a more biodiverse, beautiful and biophilic interaction for all concerned. It would also cost less both to establish and possibly to maintain, than traditional planting. The above willow is beautiful and graceful, yet I have seen it all too often used in municipal car-parks and reduced to a-n-other shrub that is caressed all to frequently with the indifference of a hedgetrimmer.

Time to re-wild our inner selves, and our urban landscapes. We can do so much better than the average landscape we see in our towns and cities.

Posted in Arboriculture, Design, Ecosystem Services, Environment, landscapes, My Garden, Regenerative Planting, Trees Tagged with: , , , , , , , , , , , ,

regenerative tree planting methodology
December 29th, 2015 by Mark Laurence

Almost all urban landscapes are contrived and designed, due to their artificial nature and short timescales of development and use.  We see increasing use of mature rootballed trees and extensive hard landscape and this is normal for intense inner urban areas; I do get concerned that the increasing complexity of urban planting systems divorce trees particularly from their natural functions and prevent the occurrence of the biological interactions/communities that go to make up an ecosystem.  For example, I have seen trees planted whose surface levels are around a metre below the surrounding paving level.  No matter how well designed, this seems fundamentally wrong to me.

So I’m thinking that there must be a way of dealing with the majority of less intense landscape zones (especially where there isn’t the financial budget that a high-end development attracts) to provide urban regeneration, ecological restoration and biophilic connection, all on a modest budget.  This would create a new method to allow for wide-spread adoption in urban and suburban zones.  I think the solution comes from Nature’s own process of natural regeneration and a developed philosophy of minimal (but specific) preparation.

silver birch regeneration

silver birch are pioneering species for natural regeneration

Starting from the observation that Nature is very efficient at regenerating itself, what can we do?  Too often, I have seen unnecessary interference in this process.  I still recall that a few years after the great storm of 1987, I walked through some nearby National Trust woodland of pines and birch.  A great deal of damage had been done with many trees blown over.  Birch had however, regrown abundantly from dormant seed and was already three or four foot tall.  The NT then sent in the bulldozers to clear out the fallen wood so the area could be – replanted.  I watched them tracking over all the natural regeneration.  Why didn’t they just leave well alone?  The restoration of the woodland was only slowed down by such clumsy interference and this was not even a productive forest.

If we simply broke up paving in our urban centres and loosened up the sub-base, what would happen?  Nature would soon find a footing and things would start to grow; however, that process would be too slow and unpredictable for human sensibilities.  So what if we did a little more, adding a small amount of topsoil to the rubble, planting small (1+1 year transplants) bare root trees and shrubs,  with plugs of understory forbs, ferns and grasses. Starting so young, we’d generate a successful community in no time.  These could be designed as narrow ribbons – two to four metres wide, inserted into suitable wider areas of paving.

An urban area suitable for natural regeneration

An urban area suitable for natural regeneration

The above area was one I thought would be suitable for such an approach; there are many such areas throughout all urban spaces.  They cry out for regeneration, yet seldom can this be done for lack of adequate finance.  Below is a quick sketch showing how it might look.

Sketch showing regenerative planting

Sketch showing regenerative planting

The benefits of such an approach would be huge.  It would cost far less than using a traditional approach to landscaping such an area, maybe half (I haven’t costed it!).  The care would move from maintenance to management, using a rotational coppice methodology, rather than trim and tidy (which always ruins a plants natural habit. Biodiversity would be hugely enhanced, air pollution mitigation would increase, wind buffering, urban heat island reduction, stormwater runoff (they would act as rain gardens) and of course, our biophilic needs, our connection to nature.

Someone needs to be bold and try it; talk to me…

Posted in Arboriculture, Biophilia, Climate Change, Design, Ecosystem Services, Environment, landscapes, Regenerative Planting, Trees Tagged with: , , , , , , , , , , , , , , , , , ,