Why gravel makes sense in dry shade

Dry shade is the awkward patch every garden seems to have. It turns up beside a north-facing fence, under the drip line of a mature apple tree, or in the narrow gap between a wall and the path where rain never quite lands. The soil is usually thin, rooty and pale, and the plants that thrive there are too often the ones we spend the summer pulling out.

Gravel flips that on its head. A generous mulch of stone shades the soil surface so moisture stops evaporating in the first place, buries weed seeds in darkness, and gives a sparse planting a sense of calm and intention. In dry shade the gravel does much of the visual work, which means you can plant less and still have a border that looks considered. Add drought-tolerant perennials and a few ornamental grasses and you have a scheme that asks very little of you. Watering becomes a monthly job rather than a weekly one, and weeding is measured in minutes.

Getting the ground ready

Before you order a single tonne of gravel, spend an afternoon tidying the soil underneath. It is far harder to fix later.

• Fork over the top 20–25cm, working round tree roots rather than through them. Severing anything thicker than your thumb is asking for trouble.
• Spread two buckets of leafmould or composted bark per square metre and fork it in. This is not feeding the plants so much as improving the soil's ability to hold what little rain arrives.
• On heavy clay, add horticultural grit at the same time. On very thin soil over chalk or rubble, an extra 5cm of topsoil is money well spent.
• Firm gently with your boots, then rake the surface into a shallow dome so water runs away from the crowns of your plants rather than sitting on them.

Then leave it a fortnight if you can. Any perennial weed that is going to reappear will do so, and you can deal with it before it is hidden under stone.

Plants that earn their place

The best dry-shade planting is roughly a third evergreens for structure, a third foliage perennials for bulk, and a third flowering things for seasonal lift. These are the ones I return to again and again.

• Geranium macrorrhizum — aromatic, semi-evergreen, and one of the few plants that genuinely carpets dry rooty ground. Pink flowers in early summer, good autumn colour.
• Epimedium x perralchicum — delicate yellow flowers in spring above handsome evergreen leaves that flush bronze in winter. Slow to establish, then utterly reliable.
• Euphorbia amygdaloides var. robbiae — lime-green flowers in April and glossy rosettes all year. Spreads steadily, so give it room.
• Liriope muscari — grass-like leaves and violet spikes in late autumn. Looks wonderful against gravel.
• Sesleria autumnalis — an underrated little grass that tolerates shade far better than most, with silvery seedheads into winter.
• Helleborus foetidus — architectural, self-seeds politely, and flowers in the dead of winter.
• Polystichum setiferum — soft shield fern. Evergreen, unfussy, and it gives the border its green bones.
• Cyclamen hederifolium — autumn flowers and marbled leaves. Plant in small groups and let it wander.

Space them a little closer than you would normally, roughly 30cm apart for the smaller perennials. Dense planting is the best weed suppressant there is.

Planting through the gravel

Plant first, mulch second. Water each pot thoroughly the night before, tease out the roots, and set the crown just at soil level — slightly proud on clay, slightly sunk on sand. Water in well and let it settle for a few days.

Then spread 5–8cm of gravel. A 10–14mm pea gravel or a 20mm angular stone both work; avoid anything too rounded, which tends to roll into paths, and avoid limestone on acid-loving plants such as epimediums and ferns. Keep the stone clear of plant crowns by a couple of centimetres so stems do not rot. If you are mulching around existing plants, hold back the gravel with one hand while you tip with the other.

Jobs for the year ahead

This is a low-maintenance garden, not a no-maintenance one, and a little attention at the right moments keeps it looking sharp.

• Spring: cut back evergreen grasses and tidy hellebore foliage before the new growth pushes through. Water newly planted things if there has been a dry fortnight.
• Early summer: a ten-minute wander with a hoe or hand fork, removing any weed seedlings while they are tiny. This is the single most important job.
• Late summer: shear back geraniums and euphorbias if they are looking tired; they will leaf up again within weeks.
• Autumn: leave seedheads and grasses standing for structure and for the birds. Top up the gravel every few years where it has thinned or sunk.

Small details that lift the whole border

Repeat one plant — a single grass or a single hellebore — three or four times through the border to pull it together. Set a couple of flat stones into the gravel as stepping places so you can reach the back without treading on the mulch. And resist the urge to fill every gap: in a gravel garden, the space between plants is part of the design, not an admission of failure. Let it be quiet. It will look better for it.