Logo

Why a Shady Corner Is Worth Claiming

Most smallholders look at a north-facing patch under a mature sycamore or beside a hedge and see a problem: moss, slug habitat, a corner that never dries out. In fact, that damp, dappled spot is one of the best places on the holding for a wildlife pond. Shade slows evaporation, keeps water cooler in a heatwave, and suits the frogs, newts and dragonfly larvae that spend most of their lives out of direct sun.

The trick is to keep it modest. A pond roughly two metres by three, and no deeper than 60cm at its lowest point, will support far more life than most people expect. Frogs prefer shallow, warm-edged water for spawning, while newts need a bit of depth to overwinter. Build both into one hole and you cover the lot.

Siting It Properly Before You Dig

The biggest mistake is digging first and thinking later. Spend twenty minutes watching where the sun falls at midday and again in late afternoon. You want a spot that gets two to four hours of sun — enough to warm the water and encourage algae-eating invertebrates, but not so much that the pond turns into a green soup every July.

Watch out for the following before you put a spade in the ground:

• Tree roots. A willow or poplar within ten metres will send roots into your liner. Move further out or choose another corner.
• Leaf fall. Some leaves are fine, but a full canopy of sycamore or horse chestnut will fill the pond each autumn and rot down, starving the water of oxygen.
• Runoff. Never site a pond at the bottom of a slope where fertiliser, slurry or road grit will wash in. Nutrients poison a wildlife pond faster than anything else.
• Access. Leave at least a metre of flat ground on the sunny side so you can kneel and watch without trampling the margin.

Mark the outline with a hose pipe or a trickle of sand, then leave it overnight. If it still looks right in the morning, start digging.

Digging and Lining a Shallow Hole

Wildlife ponds should be shallow and wide rather than deep and steep. Aim for a shape with gently sloping sides and a profile like a saucer with one deeper well at one end. Dig in stages, stepping back to check the levels with a straight plank and a spirit level.

As you dig, keep the topsoil in one pile and the subsoil in another. The topsoil goes back on the marginal shelf later; the subsoil can go under hedges or into a bank. Remove any sharp stones, glass or old wire from the hole — a single jagged flint will puncture a butyl liner, and you will not notice until the water starts dropping.

For lining, a good-quality butyl rubber liner is the most forgiving choice. Add a geotextile underlay beneath it, and a second layer of old carpet or sand on top of the bare soil if your ground is stony. Let the liner drape loosely into the hole rather than stretching it tight; leave at least 30cm of overlap around the rim. Fill slowly with rainwater from a butt if you can — tap water contains chlorine and nutrients that encourage blanketweed.

Planting Native Species That Earn Their Keep

Native plants do the heavy lifting: they oxygenate, shade, shelter and feed. Avoid anything sold as ornamental marginal planting, and never introduce invasive species such as Australian swamp stonecrop or floating pennywort, both of which are illegal to plant in the wild in the UK and will choke a small pond within two seasons.

Good choices for a shady corner include:

• Submerged oxygenators: hornwort and water starwort, which cope with low light better than most.
• Marginals: water forget-me-not, marsh marigold, lesser spearwort and ragged robin along the shallow shelf.
• Emergents: a single clump of yellow flag iris or soft rush at the deep end, kept in a basket so it does not take over.
• Floating cover: a small amount of frogbit or water soldier, which helps shade the surface and hides tadpoles from herons.

Plant in baskets of hessian or coir filled with garden soil — not potting compost, which is too rich. Sink them onto the shelves so the rim sits just below the waterline. Resist the urge to fill every gap; leave bare mud and open water, because that is what amphibians actually need.

Rough Edges and Safe Access

A pond with a neat, vertical rim is a death trap for hedgehogs, frogs and fledgling birds. Build at least one gently sloping beach of soil, gravel or flat stones so creatures can walk in and out. A ramp of rough log or a pile of stones at one corner works well, and looks natural within a season.

Leave the surrounding ground rough. Long grass, a log pile, leaf litter and a few stones around the margin give frogs somewhere damp to shelter between visits and newts somewhere to hide by day. Resist strimming right to the water's edge; a 60cm buffer of unmown vegetation is the single best thing you can do for pond wildlife.

Looking After It Without Fussing

A new pond will look alarmingly green for the first few weeks. This is normal. Do not panic, and do not reach for chemicals. Once submerged plants establish and invertebrates move in, the water usually clears by late summer on its own.

Twice a year, in late spring and again in September, spend twenty minutes with a rake. Pull out excess blanketweed or duckweed, and leave it on the bank for a day so any creatures caught in it can crawl back. Never empty and scrub a pond — that destroys the entire population you have spent months attracting. Top up with rainwater in dry spells, and let fallen leaves lie on the surface for a week before netting them out.

Within a year you should have frogspawn in the shallows, dragonflies patrolling the margin, and a corner of the smallholding that has quietly become the busiest place on the whole plot.