Compost bin not hot in winter
Updated: October 2026
You lift the lid of a dalek in January and the contents are as cold as the air on the path. A bottle beside the bin looks like the missing part. A compost bin not hot in winter is usually the season, not a failed product, and an accelerator will not turn that plastic bin into a hot heap. Listings are on the [compost accelerator comparison](/hub/raised-beds-greenhouses-and-compost/compost-accelerator). Products Compared editorial team, 15 October 2026, from the Royal Horticultural Society, council pages, and the amazon.co.uk captures. No laboratory test was run. A qualifying purchase can earn us a commission at no extra cost to you.
You lift the lid of a dalek in January and the contents are as cold as the air on the path. A bottle beside the bin looks like the missing part.
You lift the lid of a dalek in January and the contents are as cold as the air on the path. A bottle beside the bin looks like the missing part. A compost bin not hot in winter is usually the season, not a failed product, and an accelerator will not turn that plastic bin into a hot heap. Listings are on the compost accelerator comparison. Products Compared editorial team, 15 October 2026, from the Royal Horticultural Society, council pages, and the amazon.co.uk captures. No laboratory test was run. A qualifying purchase can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Form | Stated job | System | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Topline Topline Garotta 2 x 3.5 kg | Powder maker | Feeds bacteria so a heap can warm | Heap or bin | 9.0 | about £17.99 | View offer |
| Best value |  Bioefekts Bio-Composter 500 g | 500 g pack; material field Wood | Bacterial starter for mixed waste | Compost bin | 8.0 | about £7.98 | View offer |
 BritishBasics BritishBasics 500 ml | Clear liquid | Speeds heaps and bins; autumn to spring | Heaps and bins | 7.6 | about £6.21 | View offer |
On this page
A cold bin is the season, not a broken product
Microbes need warmth, and a British winter does not supply it. The Royal Horticultural Society's winter feature says the process slows unless you have an insulated hot bin. Edinburgh Council adds that a heap which is not warm may be too dry, and that composting continues more slowly when it is not steaming.
Cover an open heap and insulate with straw or bags of dry leaves. Love Essex says activity slows, and suggests leaves, straw, cardboard, or carpet on top.
Leaves, water, and air
A big fall of leaves often stalls a winter bin. The Royal Horticultural Society says fresh leaves slow a mixed heap, so bag them for leaf mould and keep the dalek for scraps. Love Essex still wants cardboard against peelings, not a solid block of either.
The moisture check is a handful. It should feel like a wrung-out sponge. If it falls apart as dust, Edinburgh's point applies: water it, and do not dose it first. If it drips, add torn cardboard and leave the bottle. A slimy mat of grass has no paths for air. An accelerator does not punch those paths.
Turning in winter
The Royal Horticultural Society says keep winter turning to a minimum, because each turn dumps heat. Love Essex says keep turning. If the bin is only quiet, leave it covered. If grass has slumped into a sour layer, turn once, add torn cardboard, cover it, and stop.
Six to eight weeks is the worked hot-heap case, not the forecast for a dalek in January. Spinning a load every few days is a drum composter, not a winter bottle for a static bin.
When an accelerator still belongs
Add a nitrogen-style maker only when the mix is brown and already moist. Leaves and woody prunings with too little grass are that case. A balanced dalek that is simply cold is not. Take any grams from how to use a compost accelerator. A sprinkle does not replace winter warmth.
BritishBasics walks into the mistake. Its bullets say the 500 ml liquid suits autumn to spring, and the bottle prints no dose. A Green Cone is a different unit. Perth and Kinross Council's sheet says a Green Cone needs accelerator powder in cold spells. That line does not transfer to a dalek of about 220 litres.
Common questions
Why is my compost bin cold?
In a British winter the bin is cold because the microbes have less warmth. The Royal Horticultural Society says the process slows unless the bin is an insulated hot bin. An ordinary dalek is not that. Edinburgh Council adds that a heap which is not warm may be too dry, and that composting continues more slowly when it is not steaming. Check a handful before you blame a missing bottle. A cold bin can still be working, only slowly.
Should I add accelerator in winter?
Add one only when the heap is brown, moist, and aired, and still short of greens. A cold, balanced dalek does not become a hot heap because you dosed it. BritishBasics says its liquid suits autumn to spring, and a review says cooler weather did nothing. The bottle has no printed dose. The Royal Horticultural Society still treats a bought accelerator as usually unnecessary when the mix and the air are right. Winter is not a standing order for a refill.
Do I turn a heap in January?
Keep turning to a minimum if the heap is only quiet. The Royal Horticultural Society says turning dumps heat. Love Essex tells composters to keep turning, so the public advice disagrees. If the bin is slimy or compacted, turn once, add torn cardboard, cover it, and leave it. Do not fork a frosty dalek every week. Six to eight weeks is a managed hot heap in Garden Organic’s account, not a January forecast.
What do I do with a big fall of leaves?
Bag them for leaf mould. The Royal Horticultural Society says fresh fallen leaves slow a mixed heap. A dalek stuffed with plane leaves goes cold and dry, and a powder will not replace the greens you crowded out. Keep a smaller share of leaves if you need browns against peelings. Love Essex still wants a wet and dry mix, which is cardboard or paper with kitchen scraps, not a solid leaf block.
Is a Green Cone the same as my plastic bin?
No. Perth and Kinross Council’s factsheet says a Green Cone needs accelerator powder in cold spells. That line is for the cone on that sheet. It does not apply to a plastic dalek, including one of about 220 litres. Your dalek wants a cover, a balanced mix, and less winter turning. Buy a powder only when the waste is brown and the moisture is already right. The cone and the dalek are different units.
Should I insulate the bin?
Yes, if the bin is open or thinly walled and you are still adding waste. The Royal Horticultural Society suggests straw or bags of dry leaves, and a cover on an open heap. Love Essex suggests leaves, straw, cardboard, or carpet on top. Insulation keeps some warmth. It does not create a hot heap in a small dalek, and it does not replace greens if the bay is all prunings. Cover first. Ask about a nitrogen maker only after that.
Related pages
Sources
Public UK and manufacturer sources from the research digest, last checked on 15 October 2026.
- RHS — Composting (retrieved 15.10.2026)
- RHS — Composting through the winter (retrieved 15.10.2026)
- RHS — Bokashi (retrieved 15.10.2026)
- Garden Organic — How to make compost (retrieved 15.10.2026)
- GOV.UK — Animal material in home compost (retrieved 15.10.2026)
- nidirect — Garden waste (retrieved 15.10.2026)
- Westland — Garotta compost maker (retrieved 15.10.2026)
- Neudorff — Radivit (retrieved 15.10.2026)