Fixing Smelly Compost: Diagnosing and Resolving Odor Problems

Balanced compost smells like earth. Bad odors signal imbalance—something's wrong with decomposition. (Exception: manure compost smells until breakdown completes. Suppress with 6-12 inches of straw/leaves/newspaper.)

Why Compost Smells Bad

Imbalance in the composting process: excess greens (nitrogen), insufficient aeration, excess moisture, poor mixing.

Targeted Fixes for Common Odors

Sewage/ammonia smell = too much green: Add browns (leaves, newspaper, straw) to rebalance.

Putrid/rotten egg smell = compaction or excess moisture: Turn pile for aeration. Add fluffy browns (dry leaves, dry grass) to prevent recompaction. For wet piles: turn and add dry browns to absorb moisture.

Sewage/ammonia from layering: Greens isolated from browns decompose anaerobically. Fix: mix pile thoroughly.

Prevention: regular turning, balanced greens/browns, proper moisture.