Lichen, January 2025

Throughout the year I get calls about grey fuzzy stuff growing on plants and killing them. The culprit that causes concern is lichen. A common misconception is that lichens are parasites feeding on landscape plants. However, they are a symbiotic relationship between a fungus and an algae. This partnership allows them to survive in some of the harshest environments on earth. They come in a variety of shapes, sizes, and colors, and can be found growing on the bark of trees and shrubs but can also be found growing on rocks. Lichens are unique and fascinating organisms and can generally be classified into three main types based on their growth forms. Crustose lichens form a thin, crust-like layer that is tightly attached to the bark or surface. They are commonly found on rocks and trees and can be difficult to distinguish from the surface they grow on. Foliose lichens have a leafy appearance, with flat lobes that are loosely attached to the bark or surface. They are commonly found on trees and rocks. Fruticose lichens have a shrub-like or branching appearance, with upright or hanging structures. They are commonly found on trees, rocks, and soil. Despite their small size, lichens play an important role in the ecosystem and do not harm plants. Overall, lichens are a fascinating example of the complex and delicate relationships that exist in the natural world. I'm Eddie Smith, and I look forward to seeing you next time on Southern Gardening!