Why compost when your garden is barely the size of a postage stamp?

It is a fair question. When every square foot of your patch is precious, giving up a corner to a heap of rotting vegetable peelings can feel like a poor trade. But composting is one of the most rewarding habits a small-space gardener can pick up. It turns kitchen scraps and cardboard into rich, crumbly compost that feeds your soil, holds moisture through dry spells and saves a small fortune on bagged compost.

Better still, home composting keeps nutrients on site. Rather than sending carrot tops and grass clippings off in the council bin, you complete the cycle in your own back yard. The result is a garden that looks after itself a little more each year — and you do not need a big plot to make it work.

Choosing a bin that suits a tight space

Before you buy anything, check what your council offers. Many local authorities sell subsidised compost bins, and the classic black cone-shaped bin with a lid and a hatch at the base is a brilliant starter. It holds plenty, keeps rain out and slots neatly into a corner.

If space is even tighter, consider these alternatives:

• Tumbling composter — a rotated drum on a stand. Ideal for patios and courtyards, quick to turn, though batches are small.
• Wormery — stacked trays where tiger worms process kitchen scraps. Perfect for a balcony, but keep it out of direct summer sun.
• An improvised bin — an old dustbin with the base cut out, or a simple heap in a hidden corner, covered with a piece of old carpet.

Put the bin on bare soil if you can, so worms and microbes can move in from below and surplus liquid drains away. If your only option is paving, raise it on a few bricks and add a handful of garden soil to each new layer.

The golden balance: greens and browns

This is the bit that trips up most beginners. Compost needs soft, wet greens that supply nitrogen and dry, fibrous browns that supply carbon. Get the ratio roughly right — about half and half by volume, or slightly more brown if in doubt — and your heap will heat up, break down steadily and smell pleasantly earthy.

Greens include vegetable peelings, tea leaves, coffee grounds, grass clippings and annual weeds pulled before they set seed. Browns include scrunched cardboard, egg boxes, toilet roll tubes, shredded paper, dry autumn leaves, straw and untreated woodchip.

The trick is to build in layers, like a lasagne: a bucketful of peelings, a good handful of torn cardboard, some grass, then more browns. Scrunching cardboard into walnut-sized pieces matters more than it sounds, because flat sheets mat together and turn slimy. If your heap smells sour or looks wet and black, you are short of browns — add more and mix them through.

Turning, moisture and a little patience

A compost heap is a living thing, and it works best when it is neither bone dry nor sodden. Aim for the dampness of a wrung-out sponge. Squeeze a handful and you should feel moisture without water running down your wrist. In a dry spell, water the heap every week or so; in a wet winter, keep the lid on and add extra cardboard.

Turning is the other half of the job. Every fortnight or so, fork the contents from the bottom to the top and the outside into the middle. This lets in air, which the bacteria need, and mixes in the cooler edges that have been lagging behind. You will know it is working when the middle feels warm to the touch, or even steams gently on a cold morning.

In winter, everything slows down, and that is perfectly normal. Give the bin a kick-start in spring by turning it and adding a few handfuls of fresh grass clippings.

What to leave out

Not everything belongs in a small garden bin. Keeping certain things out saves you from smells, pests and disappointment.

• Cooked food, meat, fish and dairy — these attract rats and foxes and turn rancid quickly.
• Perennial weeds such as bindweed, ground elder and dandelion roots, which can survive the process.
• Diseased plants, especially anything with blight or clubroot.
• Plastic-coated tea bags, stickers from fruit and veg, and glossy magazines.
• Cat and dog waste, nappies, and anything treated with weedkiller.

Eggshells are fine and add calcium, though crushing them helps them break down faster.

When it is ready, and how to use it

Depending on the season and how often you turn it, a bin will give you finished compost in anywhere from six months to a year. You will know it is ready when the original ingredients are unrecognisable, the texture is dark and crumbly, and it smells like woodland soil rather than rubbish.

For a fine finish suitable for seed sowing, push the compost through a garden sieve and return the lumpy bits to the next heap. Use the finished stuff as a mulch around shrubs and perennials, fork it into vegetable beds, or blend it with leafmould for a lovely homemade potting mix.

One last tip: keep autumn leaves separate. Raked into a bin bag with a few holes punched in the side, they quietly turn into leafmould within a year — an excellent soil conditioner in its own right.