Burls are just one of several naturally occurring curiosities concerning trees that do not cause damage to the tree. Another one that is pretty common is lichen.

They do not remove any nutrients from where they are parked. Different kinds of lichens can be found on rocks, fence posts and trees with thick, heavy bark. They need a dry surface.

“As for the use of an herbicide on the trees, it may kill the lichen, but will also kill the trees. The best you can do is be sure that the trees receive extra water in the driest times.

For instance, what are those green masses growing on your trees? Those growths could be either lichens, moss or algae, and the good news is that none are cause for alarm.

For instance, what are those green masses growing on your trees? Those growths could be either lichens, moss or algae, and the good news is that none are cause for alarm.

Actually, lichens rarely have anything to do with causing poor growth or death of shrubs and trees. Instead their appearance is often related to damage from environmental stress or poor management.

What could possibly be inspiring about that green stuff covering Oregon’s trees? What could possibly be inspiring about that green stuff covering Oregon’s trees? Lichen is a an ecological ...