Lichens on Trees: Symptom, Not Cause of Decline

A homeowner notices trees declining as lichens appear, believing lichens cause the problem. They ask about removal.

Lichens Are Harmless

Lichens don't harm trees—they merely grow on bark. Their increase signals an underlying stress (poor vigor, thin canopy, etc.) that allows more light on the trunk.

Address the Real Issue

• Fertilize with 10-10-10 at 1 lb per inch trunk diameter, watered in.
• Improve overall tree health: water, mulch, correct drainage.

Lichen Control (If Desired)

No products are labeled for lichen control. Copper fungicides (for ball moss) or baking soda may reduce them but treat the fungal partner. In pecan orchards, scab fungicides incidentally suppress lichens.

Focus on tree vitality; lichens will diminish as canopy thickens.