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.Because they usually grow on stressed or declining trees, many people assume these organisms are responsible for making their trees sick. But they aren’t parasitic; they’re opportunistic, which is to say they like to grow on trees that are already ailing or growing in poor conditions.
However, because lichens often take advantage of already stressed trees, their presence typically indicates the need for a bit of TLC. Water the trees, aerate the soil around them, and apply much to the root zone, which is the area that begins 4 inches away from the trunk and extends as far as the branches reach overhead.
If you find the moss unsightly or fear it may weigh down a branch, you can gently scrape it off or apply a copper fungicide, following label instructions.Algae, usually considered an aquatic plant, can also grow on trees, walkways, roofs, fences and houses, thriving in moist or shady areas. The green or orange film can easily be power washed or scrubbed off inorganic surfaces and should be removed when it creates dangerous conditions, such as a slippery walkway.
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