Why Your Lawn Is Bumpy Under Pine Trees

Three Common Causes

1. Tree roots – Expand and contract, heaving soil.
2. Decomposing organic matter – Buried wood, roots, needles settle unevenly.
3. Earthworm activity – Castings create small mounds over time.

Management

• Core aerate annually to relieve compaction.
• Or use a dethatcher at lowest setting to level surface.
• Mow high (2.5–3.5") and recycle clippings—masks unevenness and improves soil.

Volcanic soil is fertile but prone to bumpiness from root dynamics. Accept some texture; perfection isn't realistic under mature pines.