Composting vs a wormery
These are recommended interchangeably and they solve different problems. A compost heap is a bacterial process that handles volume — prunings, leaves, grass — and tolerates being ignored for months. A wormery is a small population of animals that handles a steady trickle of kitchen scraps, works indoors, produces a richer output in much smaller quantity, and can be killed by a hot week or a fortnight of overfeeding. The choice is usually settled not by preference but by what comes out of your garden and how reliable you are.
The decision this settles: You want to stop putting food waste in the bin, you have somewhere between a balcony and a small garden, and the two things everybody suggests are a compost bin and a wormery. They cost about the same and they are described as alternatives, which they are not quite.
Where they genuinely differ
Marked per row rather than overall — “better” only means something relative to a specific dimension.
| Point of difference | Composting | Wormery keeping |
|---|---|---|
| What it is actually forThe axis that decides it for most people, and it is answered by looking at what you throw away rather than by preference. | Volume. Garden waste, prunings, leaves, grass, with kitchen scraps as a minor input | Kitchen waste. A steady small flow of food scraps, and very little garden material |
| Space neededThe reason a wormery is the answer for flats, and the reason it is the only one of the two available to a large share of the country. | A garden corner on soil. Bigger works better, and it does not work well small | A box. Balcony, shed, garage or under the sink — genuinely viable with no outdoor space at allAdvantage here |
| Can you neglect itThe honest deciding question for a lot of households, and the one nobody asks before buying. A wormery is a small ongoing responsibility rather than a container. | Yes, almost indefinitely. A heap ignored for a year is a heap of compostAdvantage here | No. The worms are livestock — they can be killed by heat, cold, acidity, drowning or overfeeding |
| How fast, and how muchDifferent products rather than different speeds. Compost is bulk conditioner; worm castings are concentrated and used sparingly. | Two to six months hot, six months to two years cold, and large quantities of a bulky soil improver | Slower per unit and continuous, producing a small quantity of a much richer material plus a liquid |
| Cooked food, meat and dairyNeither solves it, which surprises people who bought one to deal with exactly that. Bokashi or a council food collection is the answer to cooked waste, not either of these. | No, in a domestic heap. It attracts rats, which is the commonest reason people give up | No. It is not what the worms want and it sours the bin |
| Smell and pests, indoorsA wormery that goes wrong goes wrong somewhere you live, which raises the stakes on getting it right. | Outdoors only. A working heap smells of earth; a failing one smells and is outside anywayAdvantage here | Should smell of nothing when it is right, and smells strongly when it is not. Fruit flies are the usual complaint |
| CostComposting is close to free at the entry point, which is unusual for any hobby. | £0 for a heap, £10–£40 for a council-subsidised bin, and nothing recurringAdvantage here | £70–£140 bought, or almost nothing home-built, plus replacing worms if you lose them |
| Interest as an activityA real difference in what the thing is like to own, and the reason wormeries appear in classrooms and compost bins do not. | A process to manage and diagnose. Quietly absorbing rather than engaging | Animals to keep alive. More engaging, better with children, and correspondingly more to go wrong |
Composting
Anybody with a garden that produces prunings, leaves or grass
Volume is the problem a heap solves and nothing else does at domestic scale. It costs nothing, tolerates neglect, and the output is the bulky soil improver a garden actually wants. If you have a garden, the question is usually whether to add a wormery rather than which to have.
More on CompostingWormery keeping
Somebody with no garden, or with kitchen waste and nowhere to put a heap
A wormery works on a balcony or indoors, handles the food waste a bin cannot, and produces a concentrated feed for pots and containers — which is what somebody without a garden is growing in anyway. The trade is that it needs looking after and can be lost.
Both are decay, managed, and both are governed by the same balance: wet nitrogen-rich material against dry carbon-rich material, with air and moisture in between. A wormery that has gone sour and a heap that has gone slimy have the same cause and the same fix — add dry browns, restore air — which is why understanding one transfers almost completely to the other.
Neither takes cooked food, meat or dairy in a domestic setting, and neither reliably kills pernicious weed roots or plant disease. Both are for the easy two-thirds of what a household throws away, and a council collection is the answer for the rest.
And a great many households run both, which is the honest resolution of the comparison: a heap outside for garden waste and a wormery or bokashi bin for the kitchen.
What neither page covers is what to do with the output — application rates, soil structure and crop nutrition are the growing side of the question rather than the making side, and that boundary is deliberate and recorded.
Last reviewed 2026-08-19. HobbyHQ does not declare a winner in comparisons — why.