Tag Archives: David Nettleton

A Bigger Splash – week three – story of a swimming pond for a garden designer

Vicky Wyer takes up the story…

Week three of the swimming pond saga and the garden still looks like the outskirts of a Welsh mining town.

Looking very deep now - swim area walls almost complete

The blockwork walls of the deep swim area are almost complete and now stand proud of the surrounding ground – although eventually they’ll be about 300mm below water level. As our garden is on an appreciable slope, we have planned this ‘perching’ of the pool in order to minimise the dig but also to redistribute what was in the hole around the garden.

So where our lawn was sloping it will be flatter, and beyond the pool the ground will need to be terraced to take it back down to existing levels. How this will be achieved when there are spoil mounds on almost every inch of ground remains to be seen…

Plans for our food forest

John has asked me to write a bit about our forest garden plans this week so here goes:

For those unfamiliar with forest gardens they are basically self-regulating, food-producing ecosystems designed to mimic the structure of a woodland edge – optimum light, shelter and layering of groundcover, shrub, understorey and canopy  to give abundant production.

Typical layers in a forest garden (unless you have chickens)

This is based on the principle that nature is always pushing towards climax vegetation (woodland in the UK) so why not harness that energy and work with it, adapting nature’s tendencies for our own ends.

How it should work

Briefly in an ideal forest garden all your resource inputs are minimised:

  • minimal weeding as planting or mulch covers the ground completely
  • minimal watering once established due to the woodland microclimate
  • minimal pests and diseases due to the biodiversity
  • minimal feeding as the design incorporates sufficient nitrogen fixers to feed the rest via microrrhizal activity. Potassium is added via comfrey mulches, etc

All of which is just as well as between us John and I are pretty rubbish at nurturing our own garden on the whole. Looking after three children, two dogs, a business, a community garden, a neglected house still in need of major renovation, four ducks, eleven chickens, some raised veg beds and a lawn that seems to be the mole-magnet of the county seems to fill most of our time…

Deckchairs on the Titanic? - where John and I will sit and laugh when this is all over (when we're done picking all the flippin forest garden fruit)

Factoring in existing ‘challenges’

And as with everything we do at home, our forest garden will be a bit of a compromise:  partly since we’re working with a set of existing trees, none of which fix nitrogen, partly because our garden is quite exposed with the sun and wind both coming mainly from the west, and partly because the forest garden is where our chickens roam – good for fertilisation, bad for growing a productive herb layer. Oh and then there’s the rabbits that pop over from the field next door for a little ‘silflay’ every morning…

Our Forest Garden plot - aka the chicken run - looking west

How it will work – we hope

The idea is to plant some Italian alders along the northerly boundary where they will add shelter and fix nitrogen but not shade the already dappled forest garden too much – luckily the existing trees are birches so there will be some sun getting through. An Autumn Olive (Elaeagnus umbellata) planted for its flavoursome berries next to the southerly hedge, will also fix nitrogen. Altogether this should give us enough nitrogen to satisfy the existing trees and our proposed fruit layers.

The Forest Garden plot looking towards the house (showing open cast mine inbetween)

As our soil is very sandy and free draining, the terraces we’re planning will help to retain runoff in the forest garden. Along the edges of the terraces we’re going to use the bulky tree waste and hedge trimmings we’ve stockpiled at the bottom of the garden from the removal of numerous unwanted or elderly trees and shrubs. These tree waste bunds will be covered with the turf from the old lawn to create ‘hugel’ beds; the slow break down of the tree waste will release nitrogen over a long period and enhance the soil structure. Rebel farmer Sepp Holzer uses this technique on Austrian mountainsides to great effect.

As well as fruit and nut trees, we’re planning to grow some bamboo near the pond. This will not only act as a much needed shelterbelt but we hope to harvest the shoots for eating.

It’s all happening so fast!

The apricots, almond, hazel, quince, medlar, gage, damson, Mirabelle, plum, blue honeysuckle, cherries, fig and berries-too-numerous-to-mention, have started to arrive from Martin Crawford’s Agroforestry Research Trust in Devon and various other specialist nurseries, and we’ve been busy heeling them in until the areas are ready for planting. And before you ask not all the plants are going in the forest garden – some will go nearer the house and some in the front garden.

The chickens look warily at the heeled-in fruit bushes

And we haven’t even started on the planting plans for the pond itself and its immediate surroundings! Looks like a busy weekend ahead with another round of decisions and compromises…

Recommended reading on Forest Gardening and Permaculture in practice:

Martin Crawford’s Creating a Forest Garden

Sepp Holzer’s Permaculture

A Bigger Splash – story of a swimming pond for a garden designer

After a number of requests from readers, I have relented and am keeping a blog of the construction of a swimming pond in our garden. From now on I am a client…

Sowing the seeds

We have been in the house six and a half years now. Two garden designers, two opinions, no progress. Well, not quite true. We had taken a lot of things out – conifers overgrown from the original intention twenty years ago, like cuckoos that never flew away. Delightful echoes of the past such as Choisya ternata aurea, Ribes sanguineum rosea and Potentilla fruticosa. Finally a plan starts to gel between us. It starts with a big curved border beneath the Mulberry tree. Then comes the notion of a forest garden on permaculture principles at the bottom of the garden. The fall on the lawn annoys me though, and gradually, the idea of a much larger pond between the lawn and the woodland starts to take shape in our minds. After a lot of wild sketching, we have the skeleton of a plan – a 14m by 4m swimming pond. And then unexpectedly, events intervene.  A team of Bowles & Wyer’s becomes free for a few weeks. I grab them!

Germination.

With Glen Brown, our hard landscape supervisor, I pore over drawings in the office. We discuss many different ways to build it – should we use concrete blocks, in-situ cast, polystyrene formers or timber walls? Lots of lengthy conversations and long email exchanges with David Nettleton of Clear Water Revival ensue. Eventually we go for perched concrete foundations and re-inforced hollow block walls for the main pool walls and new oak sleepers for the secondary walls. Will we be able to lose all the spoil on site? (actually that remains to be seen). Will the levels work out? (that also remains to be seen) How much concrete will we need? Can we get a digger in? All the usual designer/contractor questions. Except this time it is complicated by the fact that I am Designer, contractor and client.

“How Much?!” I find myself exclaiming; “Out of the question”. A myriad of decisions that have to be taken balancing method, size, layout, materials and of course a mass of technical details. One novel feature is that we only have to do technical drawings – no visuals or coloured presentation plans to convince a client!

The calm before the storm...

Finally, a date is set for starting on site, even though we have not yet bottomed out all the costs or details. Not exactly seat of the pants, but not quite comfortable either. On a frosty Friday in early February, the team arrive. First day is just preparation – hand clearance, draining the existing pond, making sure the route for the excavator is clear.

On the Saturday, I let our (four) ducks out as normal. three of them are Indian Runners, and true to form, they go tearing across the lawn towards the pond. Their eye level is quite low, so they don’t see that their pond has been drained until they get within a metre or two. They stop in amazement. I can almost hear the duck voices saying – “What the…where…I’m sure it was there yesterday….!” They wander back up the lawn, confused and disorientated. They will have to wait a long time for the new pond to be finished, but it will be worth it!

Week One – green shoots.

The 5 tonne digger arrives. after a quarter of a mile trek down the bridleway and a sharp 270 degree turn through the fence at the bottom of the garden, we are in! Work proceeds quickly – the lawn gets stripped, topsoil is scraped off and piled up separately. We rapidly get down into gingery coloured gravel subsoil and at the bottom of the excavation is a fine amber coloured sand layer, very free draining. By the end of Wednesday we have the bulk of the main excavation out. As a result, most of the garden is covered in large piles of soil. My 15 year old son asks me where this is all going to go. I furiously check my cut and fill calculations, cross my fingers and say airily that it will all get used up back-filling and making up the levels. Perhaps if we fill our pockets every day, like the great escape and walk around outside in little circles… 

Meanwhile, I am trying to sort out the final details with David Nettleton. PVC, Butyl or Polypropylene liner? Welded on site or off site? Do we need an Iron Reactor? As David explains: “This unit is not entirely necessary and could be added later. It’s a unit for emergencies; if the pond gets enriched with phosphorous or somehow you get a spike that encourages algae it will release Fe3+ ions into the pool to capture Phosphate Ions and precipitate them out. Very clever stuff!”. However having had our water tested, it is apparently ‘very good quality’ (which is reassuring), so for the time being we are passing on the Iron Reactor. We may live to regret it. For the liner, it is a choice between a whole roll of Polypropylene made in the UK, of which we will use about half, or the much less environmentally friendly PVC  which comes from Germany. Both are expensive (client in me speaking there) so we plump for the UK made, environment-friendly product. Friday is spent making finishing the excavation of the main pool and making everything safe. By tomorrow, we will all breathe a sigh of relief and I will not be alone in wondering where my garden has gone. On Monday, it will start all over again.

Now I know how my clients feel!

More next week…