Granny's gone and done it again

mine has the greenish mold or something growing on the bark. stunted too. I dont do anything to them. My crab apples do better then any other tree I have.
That's because crab apples are like weeds. They have been around forever... survivors!

The greenish stuff is probably some sort of lichen... an algae inside of a fungi. They produce their own food, and generally don't harm what they are growing on.
 

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