Algae, lichens and moss on trees and shrubs / RHS Gardening

Algae, lichens and moss often form green or grey, powdery or mossy, crusty growths on the stems, branches and trunks of trees and shrubs. While this can worry gardeners, these growths are harmless, although may occasionally indicate a lack of vigour in the affected plant.

What Kills Lichen & Moss on Trees & Shrubs?

Lichens on Woody Trees and Shrubs - Alabama Cooperative Extension System

I'm Liking the Lichens! - Coastal Interpretive Center

Lichens on Woody Trees and Shrubs - Alabama Cooperative Extension System

Should you worry about lichens, moss, algae on trees? – News-Herald

What Kills Lichen & Moss on Trees & Shrubs?

Search the RHS website for gardening knowledge / RHS Gardening

Managing Pests in Gardens: Environmental Factors: Lichens, Mosses and Algae—UC IPM

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Are You Lichen the Bark? Lichens and Mosses

Lichens on Woody Trees and Shrubs - Alabama Cooperative Extension System