Wormeries (vermicompost bins) turn kitchen scraps into nutrient-rich compost and liquid feed. This UK guide shows you how to set up, feed, and harvest without smells or flies.
Which wormery?
Stacked tray systems save space and make harvesting easy. A single tub with drainage also works if you add a tap or drip tray.
Best worms
Use Eisenia fetida (tiger/red worms) or Eisenia andrei; avoid earthworms from the garden—they’re not compost specialists.
Set up in 6 steps
- Place bin in a frost-free, shaded spot (10–25°C).
- Add bedding: coir + shredded cardboard + a handful of garden soil.
- Moisten to a wrung-sponge feel.
- Add worms and leave 24 hours to settle.
- Add small amounts of chopped scraps (veg peelings, tea leaves, coffee grounds).
- Cover with damp cardboard or a breathable mat.
Feeding rules
- Avoid meat, dairy, large citrus loads, and oily foods.
- Feed little and often; if food remains after 3–4 days, reduce input.
- Add a pinch of mineral grit (crushed eggshells) weekly.
Moisture & aeration
Keep bedding moist; add dry card if soggy. Drill/clear air holes. Leave the tap open to a bottle if leachate builds up.
Harvesting
After 2–3 months, move fresh food to one side to attract worms, then harvest finished compost from the other side. Strain leachate 1:10 with water for a liquid feed.
Troubleshooting
| Problem | Cause | Fix |
|---|---|---|
| Smell | Too wet or overfeeding | Add dry card; reduce feed; stir gently |
| Fruit flies | Uncovered food | Always cap with cardboard; freeze scraps first |
| Worm escape | Acidic or anaerobic bin | Add crushed eggshell; fluff bedding; check drainage |
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