SOIL · WORMS · CASTINGS
Start worm farming: a small living system for suitable kitchen scraps.
A worm farm is a compact compost system that uses compost worms, bedding and steady feeding to make worm castings. It works well when it is treated as a small habitat: airy, moist, shaded and fed only as quickly as the worms can process the material.
Set up a simple, serviceable bin
Use an opaque container with a lid, ventilation and drainage. Place it in a sheltered spot away from extremes of heat, cold, rain and direct sun. A simple two-container arrangement can keep the working bedding above a catch tray, but the goal is not to collect liquid—it is to keep the bedding aerated and comfortably damp.
| Component | Useful role | Check regularly |
|---|---|---|
| Opaque, ventilated bin | Gives worms a dark, protected home with air exchange. | Air holes are clear and pests cannot enter easily. |
| Moist bedding | Provides carbon, shelter and a stable living medium. | It feels like a wrung-out sponge, not wet sludge or dry paper. |
| Suitable compost worms | Process decomposing food and bedding near the surface. | Use compost worms such as red wigglers, not earthworms dug from deep garden soil. |
| Small food additions | Feeds the organisms in the bin without creating anaerobic pockets. | Previous food is mostly being processed before you add more. |
Build the bedding before adding food
Use a mix of shredded non-glossy paper, cardboard, dry leaves, straw or coir. Moisten and fluff it until it holds together lightly. Add a small handful of finished compost or garden soil as a starting inoculum, then introduce the worms. Keep a fresh layer of bedding over the food so the surface stays dark and less attractive to flies.
Feed little and observe often
Suitable inputs include chopped fruit and vegetable scraps, coffee grounds, tea without staples and crushed eggshells. Avoid meat, dairy, grease, strongly scented foods, pet waste and large amounts of acidic or salty material. Add food in one area, cover it and wait to see how the bin responds. Overfeeding is the most common way to turn a calm bin into a wet, smelly one.
Troubleshoot by changing the habitat
A sour smell or pooling moisture means the bin is too wet or overfed: pause feeding, add dry bedding and improve airflow. A dry bin needs a light misting and damp bedding. Fruit flies usually mean exposed food, so bury scraps and add a bedding cap. Worms trying to escape can be a signal to check moisture, food load, temperature or air.
Harvest castings, not unverified liquid
When much of the bedding has become dark, granular material, move fresh bedding and food to one side so worms migrate toward it. Harvest the finished castings from the other side, then use them as a small soil amendment, in potting mixes or around plants. Do not assume liquid collected below a bin is a safe fertiliser or plant tonic; keep the worm system focused on healthy castings and good bedding conditions.
Previous step: manage soil moisture
A worm bin needs the same balance as a healthy root zone: moisture, air and organic material working together without waterlogging.
Next step: use compost well
Once you have mature compost or worm castings, match the amendment to the plant, bed and soil task that will benefit from it.