Why compost kitchen scraps in a small space?

If you have a courtyard, balcony or a modest patch of paving, you might think composting is off the cards. It isn’t. A tidy, lidded bin tucked beside a wall or behind a pot can transform vegetable peelings, tea leaves and torn-up cardboard into dark, crumbly compost within a few months. You will cut your food waste, buy less bagged compost, and feed your containers with something genuinely home-grown. Better still, a small bin becomes a mini habitat for insects and worms — the very creatures that keep a wildlife-friendly garden ticking over.

Choosing a bin that suits a courtyard or balcony

Forget sprawling heaps. A sealed bin of 100–200 litres is ideal. Look for a sturdy plastic bin with a tight lid, a base and, if possible, a small tap at the bottom for draining nutrient-rich liquid. Wormeries and bokashi bins also work well indoors or on a sheltered balcony, but a simple lidded bin is the easiest starting point.

• Position: partial shade, close to the kitchen door, on a paved or slabbed surface so liquids don’t stain.
• Ventilation: drill a few 10mm holes around the upper sides and base if your bin has none. Cover them with fine mesh to keep flies out.
• DIY option: a clean, lidded storage box works if you add drainage holes and turn it regularly.

Keep it neat: a bin that looks tidy is one you will actually use. A brick or two on the lid stops it blowing open in a gale, and a small trowel or old fork stored nearby saves excuses.

What to add — and what to leave out

The golden rule is a mix of “greens” (soft, wet, nitrogen-rich) and “browns” (dry, carbon-rich). Aim for roughly two parts browns to one part greens by volume. In a small bin, that balance keeps smells down and decomposition steady.

• Greens: vegetable peelings, fruit scraps, tea leaves (plastic-free bags only — tear them open), coffee grounds, fresh grass clippings in thin layers, spent cut flowers.
• Browns: torn cardboard (remove tape and staples), egg boxes, loo roll tubes, plain paper, sawdust from untreated wood, small amounts of wood chip.

Leave out meat, fish, dairy, oils, cooked leftovers and pet waste — they attract rats and foxes. Also avoid diseased plants, perennial weeds, glossy paper and most “compostable” plastics, which rarely break down in a cool domestic bin. Citrus, onion and garlic are fine in moderation, but too much can slow things down.

Layering, turning and keeping it sweet

Chop scraps smaller — a quick slice through peelings and cardboard speeds everything up. Start with a 5cm layer of browns at the base, then alternate handfuls of greens and browns. Each time you add kitchen waste, cover it with a fistful of torn cardboard or paper. This traps smells, discourages fruit flies and stops the mix turning slimy.

Moisture matters. Squeeze a handful: it should feel like a wrung-out sponge, not dripping. If it’s too wet, add more browns and leave the lid off for an hour on a dry day. If it’s too dry, add a little water or more green waste. Once a week, turn the contents with a small fork or an old broom handle. This adds air and keeps the bin working. In cooler UK months, progress slows — that’s normal. A sprinkling of soil or finished compost introduces the microbes that get things going.

Troubleshooting: smells, flies and slime

• Smell of rotten eggs: too wet and airless. Turn in dry cardboard, drain any liquid from the tap, and leave the lid off briefly.
• Fruit flies: bury new scraps deep, cover with browns, and keep the lid firmly shut. A strip of fly paper nearby helps.
• Slime or maggots: usually a sign of too many greens. Add browns, turn, and avoid adding cooked food.
• Slow decomposition: chop smaller, turn more often, and check the moisture. Cold weather will always slow a small bin — be patient.
• Rats or mice: secure the lid, avoid cooked food, and place the bin on a hard surface rather than soil.

If fruit flies become a nuisance indoors, a bokashi bin for kitchen scraps plus an outdoor bin for garden waste is a tidy two-step system. It ferments everything first, then you bury it in the main bin.

Using your compost and helping wildlife

Your compost is ready when it’s dark, crumbly and smells earthy — usually three to six months in summer, longer in winter. Sieve out any stubborn lumps and return them to the bin. Use the finished compost as a top dressing for pots, a mulch around balcony shrubs, or mixed with coir for homemade potting mix. For a free liquid feed, steep a sock of compost in a watering can for a day, then dilute to the colour of weak tea.

A small compost bin is wildlife-friendly by default. It shelters worms, beetles and perhaps a slow worm or frog in a quiet corner. By composting at home, you also reduce the need for peat-based bagged compost — a direct win for fragile peat bogs and the species that depend on them. Keep your bin tidy, your layers balanced, and your patch of courtyard or balcony will quietly turn kitchen scraps into something rich, dark and alive.