Compost Troubleshooting
Technique
Compost troubleshooting means diagnosing common pile problems and adjusting the conditions that affect decomposition. Most issues come down to moisture, airflow, material balance, or particle size. A few simple observations usually point to the needed correction.
How it works
Microbes need oxygen, moisture, and a balanced food supply to work efficiently. When one factor is off, the pile may smell bad, stop heating, stay too wet, or dry out. Looking at texture, smell, and breakdown speed helps identify whether the pile is too compact, too dry, or too rich in one material type. Correcting the underlying condition allows decomposition to resume more normally.
Details
If the pile smells rotten or looks slimy, add browns and turn it to introduce air. If it is dry and inactive, moisten it evenly and mix in some greens if the pile is mostly carbon-rich material. If materials are not breaking down well, chop coarse pieces and rebuild the pile more uniformly. If pests are visiting, bury fresh scraps, avoid exposed food waste, and keep the surface covered with browns.
Tips
Change one main factor at a time so you can see what improves the pile. A healthy compost pile usually smells earthy, not sharp or foul. Routine observation prevents small issues from turning into major setbacks.
General guidance for US home gardens. For local guidance and any rules on composting, contact your Cooperative Extension office. Page updated Aug 4, 2026.