Why a small garden heap attracts more attention

In a courtyard, balcony or narrow town garden, everything is close to the house, the fence and the neighbours. That proximity is exactly why a compost bin needs a little more care than one tucked away at the end of a long plot. Rats, foxes, mice, flies and wasps are all opportunists, and they follow one thing above all else: easy food and a quiet, undisturbed corner. Get the basics right and a small heap can sit happily for years without a single unwelcome visitor.

The good news is that pest-free composting is not about expensive kit. It is about three habits: the right mix, the right bin placement, and a willingness to turn the heap now and then. Do those, and the bin will heat up, break down quickly, and smell of nothing much at all — which is precisely what keeps wildlife away.

Choose a bin that suits a small space

For tight gardens, a lidded plastic bin with a base plate is the simplest starting point. The tapered design holds warmth, the lid keeps rain out and animals out, and the base plate stops liquid leaking onto paving where rats will investigate. If you have very little room, a tumbler is worth considering: you turn it from the outside, so it suits a patio, and the sealed drum is far less inviting to rodents.

• Stand it on solid ground. Paving, a concrete pad or a sheet of wire mesh under a soil base all work. Rats will happily tunnel up through bare soil into an unlined bin.
• Leave a gap around it. Push the bin against a fence or shed and you create a sheltered run for mice. A hand's width of clearance makes the spot less appealing and easier to inspect.
• Keep it near the kitchen but not against the wall. A few metres from the back door is convenient without inviting anything to nest along the house.
• Consider a wormery or an indoor fermentation bin. In a flat or a yard with no space at all, these handle kitchen scraps without a rotting heap on the patio.

Get the greens and browns balance right

This is the single most useful thing you can learn. Greens are soft, wet and nitrogen-rich: vegetable peelings, grass clippings, tea leaves, coffee grounds, spent annuals and comfrey leaves. Browns are dry, fibrous and carbon-rich: shredded cardboard, newspaper, egg boxes, loo roll tubes, autumn leaves, woodchip and untreated sawdust.

Aim for roughly two parts browns to one part greens by volume, and add them in thin layers rather than tipping a whole bucket of peelings into one spot. Browns do two jobs at once — they soak up moisture and they keep the surface of the heap dry, which is what stops fruit flies and wasps from finding it interesting. Whenever you add kitchen waste, finish with a generous handful of shredded cardboard on top, as if you were sprinkling breadcrumbs.

The finished texture should feel like a wrung-out sponge. Squeeze a handful: a drop or two of water is perfect, a stream means too wet, and crumbly and dry means add water and more greens.

What should never go on the heap

Cooked food is the biggest culprit in pest complaints, and it is the easiest thing to give up. Cooked scraps, meat, fish, bones, dairy, oils and grease all smell far more strongly than raw peelings, and they attract rats and foxes from a surprising distance. Keep them out of an open heap entirely; if you want to compost them, use a sealed indoor fermentation bin and then bury the result in the heap or a trench.

• No dog or cat waste — a health risk and a strong attractant.
• No diseased plant material or perennial weeds such as bindweed and ground elder, unless your heap reliably reaches high temperatures.
• No glossy magazines, coated cartons or treated timber — they will not break down and may carry residues.
• No huge quantities of grass at once. It compacts, turns slimy and smells sour within a day. Mix it with cardboard or spread it thinly.

Turning, tidying and keeping things sweet

Turning is what separates a sweet-smelling heap from a soggy, fly-blown one. It introduces air, which keeps the process aerobic, and the resulting heat discourages pests and speeds everything up. In summer, aim to turn the contents every two to three weeks with a fork or an aerator tool; in winter, once a month is plenty. Pull the outer, unrotted material into the middle and the middle out to the edges, then replace the lid firmly.

Little habits matter too. Keep the area around the bin swept — spilt peelings on the paving are an open invitation. Add material in small batches rather than a big dump, and never leave a bucket of scraps sitting beside the bin overnight. If the heap ever starts to smell sour or vinegary, it has gone anaerobic: turn it thoroughly and add a good layer of browns.

Reading the signs

Pests are usually a message rather than a disaster. Fruit flies in summer mean you are adding wet kitchen waste faster than the heap can cope — bury it deeper and cover with browns. Ants suggest the heap is too dry; water it and turn. Wasps in late summer are after sweetness, so keep the lid closed and avoid adding bruised fruit. Rats mean food is sitting exposed, the bin is damaged, or something is being left out nearby. Fix the cause and the visitors move on within days.

Get into the rhythm and you will be rewarded with dark, crumbly compost within six to twelve months — enough to feed a raised bed, top-dress pots and mulch a border, all from a bin no bigger than a wheelie bin in the corner of a small garden.