Q.I’ve noticed some of the trees, particularly the Yoshino cherry trees have a green mold or fungus on the branches (outside of
the bark), as well as some white, what looks like barnacles. What is this? Is it going to affect the trees in any way? Hoping it’s NOT going to kill my trees, especially my Yoshino cherry trees.
Certified GKH Gardening Expert
What you are reporting sounds like moss and lichen, which are not considered parasitic or disease conditions. But without photos we cannot be sure.