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www.rhs.org.uk/advice/profile?PID=411

Algae, lichens and moss often form green or grey, powdery or mossy, crusty ... Algae, lichens and moss are non-parasitic plant-like organisms that colonise bark , ... Moss: Various mosses can grow on the trunks or branches of trees and shrubs.

homeguides.sfgate.com/natural-remedy-green-moss-trees-42127.html

Depending on the type of green moss, it can grow in a carpetlike form, covering the tree bark, or build up and hang down from the branches. Moss normally ...

homeguides.sfgate.com/prevent-moss-growing-trees-24891.html

To prevent moss growth on tree trunks, you must also eliminate moss from the ... Thin the branches of the trees to allow more direct sunlight to hit the trunk at ...

gardening.lohudblogs.com/2011/08/12/are-moss-and-lichen-harmful-to-trees

Aug 12, 2011 ... However, neither moss nor lichen growing on trees is harmful because they do not extract nourishment by entering the inner bark where food is ...

www4.ncsu.edu/~djgofort/Disease2.htm

Moss grows on tree bark because of the shade. ... Often the lichens will multiply when the tree slows down it's growth and the canopy becomes less dense.

www.extension.umn.edu/garden/yard-garden/trees-shrubs/non-harmful-tree-conditions

Several types of lichen growing on tree bark. Lichens are a symbiotic ... Lichens are commonly found on the bark of tree and shrubs in Minnesota. In some cases  ...

www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm

Jun 13, 2015 ... Take a look in this article to learn what lichen on tree bark are and what the ... Lichens on trees grow best in cool, partly sunny, moist locations.

www.hunker.com/12523832/how-to-treat-green-mold-on-mature-maple-trees

Apr 30, 2011 ... This can cover most of the tree trunk, creating a greenish coating. ... lichens decay, they nourish new growths, such as moss, creating more green on your trees. ... The copper-sulfate kills the fungus and prevents lichen growth.

extension.oregonstate.edu/gardening/node/1031

Feb 3, 2009 ... ... conditions for growth of lichen, moss and algae on trees and shrubs ... a bright green slash on the tree trunk in winter) is the best approach.