Vermicomposting (Worm Bin)
Method
Vermicomposting uses composting worms to turn food scraps and bedding into a rich soil amendment. It is well suited to small spaces and can be managed indoors or in a protected outdoor area. Home gardeners often use it for routine kitchen scraps that break down readily.
How it works
Worms and microorganisms work together to process organic matter in moist bedding. The worms consume softened scraps and bedding, and their castings become part of the finished material. The system works best when bedding stays damp, airy, and not overheated. As food and bedding are converted, finished vermicompost collects in older sections of the bin.
Details
Prepare a bin with moist bedding made from clean, carbon-rich materials and add food scraps in small pockets. Bury scraps under bedding to reduce odors and discourage flies, and keep the bin in a location with moderate temperatures. Add new food only after earlier additions are being processed and avoid letting the bin become waterlogged. Harvest finished material when much of the bedding and scraps have turned into dark, fine particles.
Tips
Freeze or chop scraps before adding them if you want faster breakdown. Keep a generous layer of dry bedding on top to help control moisture and odor. If worms cluster at the sides or lid, review moisture, airflow, and recent feeding patterns.
General guidance for US home gardens. For local guidance and any rules on composting, contact your Cooperative Extension office. Page updated Aug 4, 2026.