The layer most gardens skip is the one below the datum
Everyone budgets for the plants. Almost nobody budgets for the soil, the drainage and the three years of establishment that decide whether the plants live.
Look at the section of a designed border and roughly half of it is below the datum line — the topsoil, the root run, the land drain. It is the half that costs real money, takes real time, and never appears in the photograph. It is also the half that gets cut when a budget is tight, which is exactly the wrong place to cut.
The soil is the build
A herbaceous border is only as good as its top spit. A tree is only as good as the volume of soil its roots can reach. When we price a garden off the section, the depth of good topsoil, the improvement it needs, and the drainage under it are in the number before the first plant is costed — because they set whether the planting above them is a garden or a holding bed.
Plants into subsoil
A border planted straight into compacted builder’s subsoil, no drainage, no improvement. It looks fine in May, thins by its second summer, and by the third the gaps are winning. Nothing was wrong with the plants. There was nothing under them for the roots to do.
Drainage is not optional on a flat site
A border that sits wet in winter rots at the crown, whatever you plant in it. A land drain laid to a shallow fall — a 1 in 80 is plenty — takes the winter water off the root zone and is invisible the moment the topsoil goes back. It is the cheapest insurance in the whole build and the first thing value-engineered out.
Reduced level dug to formation, a land drain to fall, four hundred millimetres of screened and ameliorated topsoil, left to settle before planting. It is undramatic, it is under the ground, and it is the reason the border is still full in year five.
Then someone has to hold it
A garden is planted small and read mature, and the gap between the two is the first three years. Young plants need watering to a plan, formative pruning, and the honest gapping-up of whatever did not take. We build that establishment into the job rather than leaving it as a surprise, because a planting plan handed over and walked away from is not a garden yet — it is a garden’s first draft.
Ask what is under the drawing
Book a visit and we will tell you what the ground needs before anything is planted in it — and what it will cost to do properly.