Category: Adaptive Planting

The self-seeded garden
May 14th, 2020 by Mark Laurence

About 60% of my garden planting consists of self-seeded plants, which might seem surprising. I’m particularly focusing here on my dry garden but the same applies elsewhere. So how do you keep an acceptable aesthetic when plants put themselves here or there, without consultation?

I find that a different attitude to that of the “traditional” gardener is useful, if not essential. I like the dynamic and surprise of the shifting combinations and patterns that occur. Very few of these plants are annuals, most are short-lived perennials, with some grasses, herbs and shrubs. With a few exceptions, these are plants I have introduced to the site over the years and which have found their “happy”.

Salvia nemorosa, Carex petrei & Crambe maritima

Walking around this morning, I made this list (in no particular order):

  • Aquilegia vulgaris
  • Crambe maritima
  • Fragaria fresca – alpine strawberry
  • Geranium sanguineum
  • Salvia nemorosa
  • Euphorbia characas – various forms
  • Euphorbia myrsinites
  • Foeniculum vulgare purpureum – purple fennel
  • Pentaglottis sempervirens – green alkanet
  • Cynara cardunculus – cardoon
  • Eupatorium cannibum
  • Stipa tenuissima
  • Festuca glauca
  • Carex petrei
  • Verbascum olympicum
  • Galactites tomentosa – annual
  • Sisyrinchium striatum
  • Geum rivale
  • Lavandula (hidcote or similar)
  • Rosmarinus officinalis (Salvia rosmarinus)
  • Acanthus spinosus
  • Phlomis russeliana
  • Melissa officinalis – lemon balm
  • Valeriana officinalis – common valerian
  • Verbina bonariensis
Galactites tormentosa is an attractive annual. I pull it out as soon as it’s finished flowering

There are others, but these are the usual suspects. I have a range of about 15 shrubs and sub-shrubs that form a more static framework and those listed seed themselves around and between at will. I have to be ruthless and remove plants from where they are not wanted, and that’s always hard (they often end up in my nursery). And of course, there are many other self-seeders which we would traditionally call weeds: veronica, greater celandine, field forget-me-not, buttercups etc. They all have their own beauty and I could never manage to eradicate them, even if I was of a mind to, which I’m not (bindweed is another matter).

Foeniculum vulgare Purpureum, purple fennel

So form structure with your shrubs, herbs and other prime perennials, and let the remainder shift around; they’re not annuals (apart from the Galactites), so the scene doesn’t change radically from year to year, but over a slightly longer cycle. This works well for a mixed or herbaceous border, but is especially well suited to a dry, gravel garden style, where there are few or no border edges to maintain.

Some plants can be overwhelming and a few invasive, so best avoid those. I now severely limit the amount of Phlomis russeliana I have in my borders; stunning though it is (the winter seedheads are wonderful), it is a thug and will swamp out lesser plants and it produces a copious amount of seedlings.

Crambe maritima, seakale in front of more structural Artemisia arbrotanum. Seakale is also edible, try the flower florets raw or cooked like purple sprouting broccoli, but leave some to flower for the intoxicating honey scent!

Gardening like this is more of a co-creation; you are working with nature and not entirely in control. There are many benefits to this, not least the surprise of an unexpected combination, or the sudden appearance of plants you never knew set seed. This is a great example of adaptive planting, where plants are fully attuned to the climate and local conditions. Give them a chance and see what happens!

Posted in Adaptive Planting, Design, Dry Garden, Edible Planting, Garden Design, landscapes, Natural Landscapes, Planting Design, Uncategorized Tagged with: , , , , , , , ,

April 15th, 2020 by Mark Laurence

A tide of change is sweeping the world, changing all before it. Where we will end up, no-one knows, but things will not be the same again, nor will Coronavirus – COVID 19 – go away in a few short weeks. Yet amidst all the fear lies a golden opportunity to reset the way we live, change the world economy and mitigate the worst of climate change. The outcome could be a better society and quality of life, but there are no certainties it will happen.

Fifteen or so years ago, I thought the world crisis would be about energy as we hit “peak oil” and supplies started to become more expensive. In July 2008 oil costs hit an all-time high of $147/barrel and was part of the cause of the recession of that time. Energy demand appeared to outstrip supply, although the surge may also have been brought about by speculative trading. According to the IEA, peak conventional oil production occurred in 2006; if so, this has since been masked by the production of unconventional oils and the rapid rise of solar and wind, which are now cheaper than coal. The crisis was postponed, then forgotten by the majority. Right now, in the midst of this C19 crisis, crude oil prices have fallen, in some cases to unparalleled lows. This will price fracking and shale oils out of the picture, but will damage the renewables market too.

In recent years, the climate has come into focus and a global outcry arisen at the lack of concerted government action. This outcry was 20 or 30 years too late, although it may have needed a generation who would actually look at the issue. The high level of action demanded to counter the climate catastrophe never materialised, instead it took a microscopic virus to galvanise the world into drastic action. The action, of course, was for self preservation against C19, yet has the (temporary) effect of being action against the world’s level of carbon emissions. Why we couldn’t see the need for such self preservation against an uninhabitable planet, I don’t know; a matter of scale, perhaps. If we live just nine meals from anarchy, then it implies we also don’t look much further ahead than that. At least governments can no longer argue that we can’t put in place climate solutions quickly; Coronavirus has blown that myth out of the water.

So the question is, what happens next, once C19 is “under control”? I believe that governments and business the world over, will try to kick-start the same old system, get the economy going again, and resume business as usual. Or try to. I don’t think that the C19 story will be over that easily; I’ve heard from people that know better than me that it likely to return in waves, or cycles, perhaps as often as three-monthly. Even if this only happened every few years, the economy would get hit and stall again, start up again, stall again. Governments will respond in one of two ways: totalitarianism, like China and populist regimes, or co-operation and people-centred policy like some more enlightened countries. Certainly, those with populist leaders appear to be heading into deep sh*t, like Brazil and the USA. Time will tell, we can but watch.

Will we be able to do city crowds again?

This on-going wave of multiple crisis will eventually cause a global rethink and a difficult switch to a circular economy. Resilience and just-in-time linear supply are not really compatible, as has been shown by recent events. So far we have been lucky in that the shortages on the shelves have not actually been production shortages but those caused by excessive demand, but the next wave of them may be as companies struggle to fulfill orders and deal with near-bankruptcy, staff and material shortages and transport problems. God only knows how this will play out in third-world countries.

We may never be able to travel the world again in the way we did before and that will be a good thing overall. Travel has become easy, cheap and taken for granted. As a result, I don’t think people actually appreciate the value of the experience and the environmental costs are high, not just in terms of aviation. Global hotel chains and the hospitality industry now sway on the brink. I speak here as one who loves travel, and I have often worked in the Middle-East. I was in Dubai in February, which seems surreal now; it may prove to be my last visit.

I read of the intentions of huge mega-projects in Saudi (for example), aiming to get right back on track as soon as possible, to build vast new resorts, even cities. Even if such things can now be afforded, I just cannot see tourism ever being quite the same again; the blind insistence in business-as-usual worries me a lot.

On the positive side, we may come to see travel as more of a land-based adventure. When I was twenty, I traveled (hitch-hiking) over land and sea from the UK to Tunisia; it took 16 days and was an amazing experience, better than the actual arrival at my destination and the short flight home was an anticlimax. Travel broadens the mind, but that cannot be said for a lot of tourism, where there is minimal contact with cultures and holidays become a voyeuristic selfie-fest.

Business will travel less and go virtual, both nationally and especially, internationally. A lot of meetings that I used to travel to London for are now virtual and will probably remain so afterwards; as with many conferences and seminars.

What will happen to Retail – will it survive?

One good thing that has been emerging over the last few weeks has been the reprieve of nature from the effects of pollution. Images of murky waters turning clear, wild animals wandering empty streets, clear air over smog-riddled urban centres, empty roads, quiet skies. It’s as if the world was acting in concert to mitigate climate change. Again, it’s showing up the lie that we can’t act faster to bring carbon under control; which is the larger threat to our survival? We act from a place of fear to an imminent medical emergency, whilst barely moving on the slow-motion tsunami that is on the horizon.

If we take the principles of Gaia, or just think in terms of natural systems, C19 could be the planet – Nature – giving us a really big shake up. It seems that these viruses (there are many, many more) are emerging from an over-intensive contact and abuse of nature, specifically in the harvesting of wild animals for meat. Gaian principles might well expect to re-balance an out-of-kilter system, for we humans have become a cancer in our destructive habits and for all our consciousness, we act without thought or regard to the consequences. Nature would do far better without us, something we should keep in mind.

On the positive side, there is much effort to bring about the emergence of regenerative agriculture, socially responsible business, environmentally beneficial ways of living and reduced consumption and pollution. These are nice – and essential – ideas but you only have to look at how Trump is wiping out environmental protections, how big business is maneuvering for the come-back and how China is commissioning vast new coal-powered energy capacity to see this is not likely to go well.

What MAY force through the necessary changes of behavior, is going through the cycle of pandemic-recovery-pandemic that I outlined at the beginning; the old system needs to be shaken and broken up thoroughly before the new can emerge. Unfortunately, we are in for a pretty rough ride.

Better buckle up, and see how we can all adapt and prepare.

Posted in Adaptive Planting, Climate Change, Coronavirus, Economic Issues, Ecosystem design, Environment, Middle-East, Sustainability Tagged with: , , , , , , , ,

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
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.

Can we create 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 also essential, but perhaps 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: , , , , , , , , , , ,

Mark Laurence's gravel garden
February 2nd, 2020 by Mark Laurence

Gravel gardens have been around a long time yet with a few well-known exceptions (Denmans, Beth Chatto and more recently, Olivier Filippi), never really make it into the mainstream of garden design. I suspect that for some designers, there is insufficient structure to satisfy, yet that is actually one of the main benefits. This makes them low-impact, from a carbon perspective, and naturally adaptive, with the kind of planting they use.

I have been designing such gardens for the past twenty plus years, and a part of my own garden is gravel, on the area of an old driveway; it’s the part I enjoy the most. Unlike perennial borders, there is structure all year round and I often wander around in the depths of winter, enjoying the shapes and forms, or the scent of rosemary (sorry to say, now officially Salvia). It’s like you’ve brought a little bit of the Mediterranean into the garden. Plants self-seed around and it’s always a bit different every year. It’s a style also eminently suitable for the arid regions of the Middle-East, whether xeriscaped, or not.

Not everywhere is suitable for a gravel garden and the obvious criteria of sun exposure and poor(ish), free-draining soil are a must. Whilst drainage and soil structure can be altered, aspect cannot. The other factor, frost/cold exposure is actually not such a barrier, although it will limit the plant choice a bit.

A part of the design of the gravel garden described below

Some years ago I was tasked with turning an old farmyard on the South coast of England into such a garden. The compacted rubble was on average 50cm deep, so we loosened and/or removed about 400 tons and replaced a similar amount of topsoil into slightly contoured mounds. As it was a farm, the soil was already available stacked on site and there was somewhere to remove the rubble to. We then rotovated 50cm of gravel into the mounded soil to improve drainage and planted with a range of “Mediterranean” plants. Most were from this region, with some Australian/New Zealand species, most notably Phormium (which I probably wouldn’t use today). We also built a stream and water feature, using 30 tons of boulders (glacial, so not strictly true to theme).

Adding 400 tons of soil
Rotovating in a thick layer of gravel

If I were doing this today, I’d leave even more of the rubble in place and blind the soil in over it. Over time I have come to realise that such conditions are an advantage, and expected by many Mediterranean plants.

Placing boulders and a stream+pond

We used a drip irrigation system for the first year of establishment, which was then switched off in the second year. A 50mm deep dressing of 20mm diameter marine shingle covered everything, including the paths, which were left from the original, compacted sub-base.

Planting
After One year
After Two years
After Four years

I tracked this garden for a few years until the property changed hands and learnt some valuable lessons (as you always do), such as don’t put too many larger growing shrubs in, as the openness of the spatial structure becomes compromised. Whilst they are good at establishing initial structure, be prepared to remove some of them as the garden matures. Some, like the Cotinus and Tamarix, were meant to be coppiced every few years, but didn’t have this done. Some perennials work better than others and low mounding shrubs are what make the predominant visual structure of the site.

This last two pictures, plus the header, are a part of my own gravel garden, created over an old driveway, where I constantly experiment with new plants and slowly expand it all.

My gravel garden. Mounded foliage dominates the structural form

Gravel gardening has much to offer and is an appropriate approach for our time, being of low carbon footprint and using plants that are adaptive and generally tough. Have a go, or get me to help…!

Posted in Adaptive Planting, Biophilia, Climate Change, Design, Dry Garden, Environment, Garden Design, Landscape Futurism, landscapes, Middle-East, My Garden, Natural Landscapes, Planting Design, Sustainability Tagged with: , , , , , , , ,

Trees add height and microclimate
December 9th, 2019 by Mark Laurence

Landscapes are all about creating micro-climate, or would be, if designed for that goal. Why is this important and what do I mean?

Almost all life is contained in a thin crust of soil, a wedge of atmospheric gases, and water. Plants are the principal medium that interacts with and regulates all three. Absolutely nothing else does this as well, or at all; think about it.

The way we organise our plants in our urban landscape will determine how well this interaction occurs, how successful it is. Yet I have never heard of a single project that has been developed with this understanding and this goal in mind. With climate change, we urgently need to re-think the way we design our landscapes, and why we design them. Whilst all the human-centric design reasons will always hold true, we need to layer into our thinking this new understanding of how plants interact. To build new ecologies, new ecosystems, we have to design for plants to actually function, rather than just look nice. For when they do this, our environment literally comes alive. More importantly, they might just, if done on sufficient scale, save us from ourselves.

When I use the word treescapes, I don’t just mean trees and grass; we’ve had that for years in the form of parks, and in their traditional form, they’ve done little for us. No, our designs need to build up layers of living material – biomass, for with biomass comes moisture entrapment, shade, food for insects, etc. Think of it in terms of height and depth of microclimate. How much depth is there in a stretch of irrigated grass, maybe 50mm above ground, 200mm below? No species variation, so what we have is little more than a green desert, albeit one that can hold bit a of moisture.

Trees in paved streets are also less able to generate micro-climate, but they are a bit of an exception, as they provide shade for people to walk under. Where width allows, even here we should layer our planting.

Trees in grass lose most of their microclimate
Trees in grass lose most of their microclimate and ecology. Traditional design fails us here.

If we replace that grass with a range of groundcover plants – not a monoculture – you begin to get a little more variation; different root structures and depth, different foliage shapes, height, form and flower. More variety, more microclimate, more food source, more ecology. Looks good too.

Next we add shrubs and suddenly we are into an new realm, that of woody plants (I’m being simplistic here, many groundcovers are of course woody). Shrubs create three-dimensional space with their frameworks, within which micro-worlds reside. Deciduous plants shed their leaves, as do evergreens, and this begins to build leaf litter – mulch. Don’t tidy it up! We need ecologies in that soil, and microbes need food. Our obsession with tidyness has a lot to answer for. Suddenly, we have height in our micro-climate, three-dimensional form. We humans (for we scale everything according to our own height and perception) can walk amongst these plants, take part, interact. Our microclimate is now two metres high, maybe more. But something is missing and it’s still too hot…

Here we have (in Umm al Emarat park, Abu Dhabi) the beginings of an true microclimate. This is a treescape.
Here we have (in Umm al Emarat park, Abu Dhabi) the beginings of a true microclimate. This is a treescape.

Trees! Now we have a game changer and our micro-environment just became vast, in relative terms, maybe up to 30 metres, though 10-20m may be more average. We now have true diversity of shape, height, leaf, flower and roots. We have shade! Under trees it may be 10°C cooler and we love it. Plants love it too. Moisture now gets retained within the human habitable zone, fungi and microbes thrive in soils, insects and birds abound. This is our urban jungle and we need it. The planet needs it. This tiny sliver of crust we live on can be rich, abundant, in every climate and every place, if we put our minds to it, if we have the will. And when the planet becomes searing, creating livable environments with trees of any type, may be the only thing that keeps us alive, unless we become troglodytes.


This is the next level of landscape design, the new challenge; creating future ecologies and environments that matter, that keep us cool, that give us resources and soothe our souls. We will create new (novel) ecologies that fit the changing environment, trans-migrating parts of ecologies that once lived elswhere. In that place they may be dying out, as might your local ecology. If they now fit where you live, that’s where they need to be. In turn, that place of origin may itself need to adapt and change. In all things and all places, we need microclimate, shade and soil.

Are you up for it? I am!

Posted in Adaptive Planting, Arboriculture, Biophilia, Climate Change, Design, design principles, Dubai, UAE, Ecosystem Services, Environment, Garden Design, Landscape Futurism, landscapes, Middle-East, Planting Design, Sustainability, Trees, Treescapes, Urban Landscapes 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: , , , , , , ,