Gray Sheath on Rose of Sharon and Crape Myrtle: Lichens, Not the Killer

Identification

Peelable gray/white leafy sheath = lichens. Symbiotic, non-parasitic, indicate clean air.

Real Issue

Lichens don’t kill trees. Something else (stress, drought, root issues) is weakening the plants, allowing lichens to proliferate.

Action

• Fertilize with 10-10-10 (1 lb per inch trunk diameter) to boost vigor.
• If desired, copper fungicide or baking soda spray (0.4 lb/gal) may reduce lichens.
• Address underlying stress (water, soil, compaction).

Healthy canopy shades out lichens naturally.