Vermicomposting: Worm Composting at Home

GardenDraft Team · May 29, 2026 · 5 min read

Part of: Soil, Compost & Fertilizer Guides

Vermicomposting is composting with an enthusiastic, tireless workforce: a bin of worms that turn your kitchen scraps into one of the richest soil amendments there is. It's odorless, takes up almost no space, runs indoors year-round, and is perfect for apartment gardeners or anyone without room for a compost pile. The worms do nearly all the work; you just feed them.

Why worm castings are worth it

What comes out of a worm bin (castings, the polite word for worm manure) is a dark, crumbly, biologically alive material that's gentler and more nutrient-available than ordinary compost. A little goes a long way: mixed into potting soil, sprinkled around plants, or steeped into a liquid feed, castings improve soil structure and feed plants with a microbial richness that's hard to match. For a container or raised-bed grower, a worm bin is a steady, free supply of premium fertilizer.

Setting up a worm composting bin

The whole system is simple:

• A bin. A shallow plastic tote with air holes, or a purpose-made worm bin, kept somewhere that stays between about 55 and 80°F — a basement, closet, or kitchen corner. Worms dislike extremes of hot and cold.
• Bedding. Fill it with moist shredded newspaper, cardboard, or coir — damp like a wrung-out sponge, never soggy. This is the worms' home and a carbon source.
• The right worms. Use red wigglers (Eisenia fetida), the composting species — not earthworms dug from the garden, which won't thrive in a bin. A starter pound establishes a bin quickly.

Feeding the worms

Bury kitchen scraps in the bedding and let the worms come to them. They eat fruit and vegetable scraps, coffee grounds and filters, crushed eggshells, and tea bags. Avoid meat, dairy, oily food, and large amounts of citrus or onion — these smell, attract pests, or upset the bin. Feed in moderation; a bin that's overfed faster than the worms can process it turns sour. Done right, a worm bin is genuinely odorless. If it smells, it's too wet or overfed, so ease off and add dry bedding.

Harvesting the castings

After a few months the bedding has mostly transformed into dark castings. To harvest, push the finished material to one side and add fresh bedding and food to the other; the worms migrate toward the new food over a couple of weeks, and you scoop out the (nearly worm-free) castings from the old side. Then mix them into your potting mix, side-dress your plants, or brew them into a compost tea. It's the lowest-effort, smallest-footprint way to make your own first-rate fertilizer, and a surprisingly satisfying one.