Why Build a Stumpery in a Shady Corner?

A stumpery is exactly what it sounds like: a deliberate arrangement of tree stumps, logs and upturned root plates, stacked and settled into a shady border so that ferns and mosses can colonise the crevices. The Victorians made a fashion of them, and it is easy to see why. Where most gardeners see a sunless, root-ridden corner to be endured, a stumpery turns the problem into the feature.

The advantage over a plain fern bed is structure. Ferns are beautiful but they can look shapeless when planted straight into flat soil. Set against the contorted grain of an old root ball, their fronds read as sculpture. The wood also keeps roots cool and damp, holds leaf mould in place, and gives you planting pockets at several heights without building a wall.

Choosing a Site and Sourcing the Wood

You want somewhere with light shade to full shade — north or east facing is ideal, or the shadow of a hedge or mature tree. Dappled shade under a deciduous tree suits ferns best, but keep clear of surface roots if you can, because digging around them does more harm than good. Damp air matters as much as damp soil; a spot sheltered from drying wind will reward you.

For the wood itself, freshly felled stumps are heavy and slow to settle, so weathered material is better. Ask a tree surgeon for a few root plates from windblown or felled trees — oak, beech, ash and sweet chestnut all last well. Hardwoods rot more slowly than conifer, though larch and pine bring their own characterful shapes.

• Root plates — the upturned base of a felled tree, roots fanned upward. These are the backbone of the feature.
• Logs — 30–60cm lengths of varying diameter, for stacking and edging.
• Stumps — squat, stable pieces to sit on end and plant around.
• Bark and brash — smaller pieces to tuck into gaps and shelter young moss.

Avoid treated timber, which will not host moss or fern roots properly, and give anything suspiciously damp a good brush before moving it.

Arranging the Structure

Build on soil, not on paving or membrane, so that moisture and mycelium can move freely. Mark out a rough circle or kidney shape and start with the largest root plate, tipping it so the root fingers lean back into the border and the flat cut face angles forward. That gives you a south-facing (or at least outward-facing) wall of nooks.

Work outward from that anchor, laying logs in shallow arcs and propping smaller stumps at angles rather than stacking them neatly. Aim for two or three tiers, no more than about 60cm high, so it looks like a natural tumble rather than a woodpile. Leave the biggest gaps — anything from a fist to a football in size — facing upward or sideways; those are your planting pockets.

Before you plant anything, firm each piece by rocking it into the soil and packing damp leaf mould around the base. Water the whole structure thoroughly and leave it a fortnight. Anything that settles or shifts will do so now rather than after your ferns have rooted.

Planting Ferns into the Crevices

Fill each pocket with a mix of two parts leaf mould, one part garden compost and a handful of coarse grit or bark chip for drainage. Ferns hate sitting wet, even though they love damp air.

Good British garden ferns to work with:

• Hart's tongue fern (Asplenium scolopendrium) — glossy, strap-like fronds that suit vertical crevices beautifully and tolerate dry shade once established.
• Hard fern (Blechnum spicant) — neat, ladder-like and happiest in acid, humus-rich pockets.
• Soft shield fern (Polystichum setiferum) — generous, arching and evergreen, ideal at the base of the structure.
• Autumn fern (Dryopteris erythrosora) — new fronds emerge copper-pink, a lovely colour echo against grey wood.
• Polypody (Polypodium vulgare) — tuck this into the tightest cracks and let it creep.

Plant small. A nine-centimetre pot slipped into a pocket roots faster than a large specimen wedged into one. Set the crown slightly proud of the compost, water in, and mulch the surrounding wood with a little leaf mould to hold humidity. Space plants so each fern has room for its full spread — overcrowding is the commonest mistake.

Encouraging Mosses and the Finishing Touches

Moss will arrive on its own if the conditions are right, but you can hurry it along. Scrape moss from a damp wall or path, crumble it into a yoghurt-thin slurry with water, and paint it onto bare wood. Keep it misted for a few weeks. Rough, shaded, low-nutrient surfaces work best — oak and sweet chestnut are excellent hosts.

Keep the wood clear of fallen leaves, which smother moss and trap too much moisture against fern crowns. In dry spells, water the whole structure slowly with a can rather than blasting it with a hose, and use rainwater if you have a butt; it is kinder to both moss and fern.

Looking After It Through the Year

In spring, remove dead fronds before the new croziers unfurl, and top up any pockets that have slumped. Summer is mostly a matter of watering and enjoying the way the light moves across the fronds. Autumn brings leaf fall — sweep the wood clear but leave the leaf mould you make from it to use as next year's planting mix.

Over time, the structure will soften, green over and quietly become part of the garden. That is the point. A stumpery is never really finished; it is simply handed over to the ferns, the moss and the weather, which do a far better job of arranging it than we ever could.