A lichen is an unusual organism composed of a fungus and an alga
living together in the same body. Lichens often appear as green to gray-green
leafy or crusty growths on the trunks or branches of plants. Typically, they
occur in abundance on plants that are declining in health or vigor. They are
harmless to the plant, and are in no way responsible for the poor health of the
plant. Less vigorous plants tend to be more open, increasing sunlight
penetration, and subsequent lichen growth.
Controls are not necessary.
Lichens will gradually disappear if the health of the plant is restored.
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