moss on my Maple trees

Asked January 5, 2021, 7:03 PM EST

It seems my Maple trees have heavy moss that wraps around the entire trunk. The doug fir trees in the same area don't have the moss growing on the bark (are they immune to moss?). Is this normal for older maples (they are about 75 years old) to have heavy thick blankets of moss? Also, the center of many of our older maple trees are rotten and hollowed out--is that normal for maple trees?

Thanks for letting me know.

Clackamas County Oregon

1 Response

Thank you for your questions. First, moss is an important plant in cool, moist environments such as the Pacific Northwest. It does not harm trees, nor does it help them so much as the wildlife which live in the surrounding environment. You can read about it here: https://s3.wp.wsu.edu/uploads/sites/2073/2014/03/021414.pdf Second, as to rot in older trees, this is not normal, cannot be diagnosed without visuals, and deserves the attention of a certified arborist to conduct an evaluation. The trees may be safety risks to property and animals. You can find such an expert on this webpage: https://www.treesaregood.org/findanarborist/findanarborist Good luck!