Identifying Small Dirt Mounds: Earthworm Castings vs Ant Hills

Introduction

Small (1–2 inch) crumbly dirt mounds in centipede grass are likely earthworm castings or ant hills.

Earthworm Castings

• Black/gray, clumped, worm-shaped or fused pellets.
• Sign of healthy soil; worms aerate and recycle nutrients.
• Encouraged by organic matter (leaves, grass clippings, bone meal).

Ant Hills

• Sand-like, granular, often with central hole.
• Bait with sugar or commercial ant traps to confirm.

Images for Reference

• Worm castings
• Lugworm casts
• Single worm cast

Conclusion

Worm castings are beneficial; ants are minor nuisances. Identify via appearance and baiting.