Growth on Azalea Bark

Question

Have a number of azaleas, most are doing great but a few have this pale blue-green, flaky looking growth on the bark, like you sometimes see on really old plants but these are fairly young. What is it and will it infect my other plants?

Answer 1

This is lichen, which is not harmful to the plants. This article will explain more about them: https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm