Lichens are fascinating and complex living organisms that are composed of multiple organisms growing together for the mutual benefit of one another. Lichens can grow in colonies on pretty much any substrate anywhere on earth, including the Tropics and Polar Regions. Frequently found on rocks, fences, tombstones, and soil, lichens cause the most concern when present on living trees and shrubs. While often found on woody plants in poor or declining health, they are not causing the decline; lichens are neither pathogenic nor parasitic.
This publication discusses the biological components in lichens, where they grow, concerns related to lichens, types of growth habits, and what should (and should not) be done when found on landscape plants.
Lichens in Landscape Plantings (PPFS-GEN-20) is available online.
For additional publications on diseases and other issues affecting landscape plants, visit the UK Plant Pathology Extension Publications webpage at https://bit.ly/3DfV8zr.
Categories: Kentucky, Crops, General