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DIY Worm Compost Bin Ideas for Beginners (Step-by-Step)
Worm composting (vermicomposting) turns kitchen scraps into rich fertilizer, and it fits under a sink or in a shed. A DIY worm compost bin costs very little to make. Here’s a step-by-step guide for beginners.
Bin ideas
| Design | Pros | Best for |
|---|---|---|
| Single plastic tub | Cheapest, easiest | Beginners |
| Stacked tubs (2–3) | Easy harvesting | Families |
| Wooden box | Breathable | Outdoors or shed |
| Bucket bin | Very compact | Apartments |
Build a two-tub bin
- Get two identical opaque plastic tubs with a lid.
- Drill small holes (5 mm) in the bottom of one tub for drainage.
- Drill air holes near the top and in the lid.
- Nest the drilled tub inside the undrilled tub, which catches liquid.
- Put spacers (e.g. bricks or blocks) between them.
Add bedding
- Shredded newspaper or cardboard.
- Coconut coir.
- A handful of garden soil for grit.
- Moisten until it feels like a wrung-out sponge.
Add worms
- Use red wigglers (Eisenia fetida), not garden earthworms.
- Start with about 500 g of worms for a small bin.
What to feed
| Feed | Avoid |
|---|---|
| Fruit and vegetable scraps | Meat and fish |
| Coffee grounds and tea bags | Dairy |
| Crushed eggshells | Oily or salty food |
| Shredded paper | Citrus and onion (in large amounts) |
- Chop food small so worms eat it faster.
- Bury food under the bedding.
- Feed small amounts once or twice a week.
Harvest the castings
- After 3–6 months, move bedding to one side and add fresh bedding and food to the other side. Worms migrate, and you can harvest the finished compost.
Troubleshooting
- Bad smell: too much food or too wet; add dry bedding.
- Fruit flies: bury food and cover with paper.
- Worms escaping: too wet or too acidic; add bedding and eggshells.
Tip: Keep the bin between 15–25°C. Worms slow down in cold and can die in high heat.
FAQ
How many worms do I need? About 500 g (roughly 1,000 worms) for a small household.
Does a worm bin smell? Not when managed properly. It should smell like earth.
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