By Saldennis
United Kingdom 
This year I have a yellow/grey lichen like substance on several trees and shrubs in my garden. They mostly face south and are certainly not in damp positions. I live on the North Norfolk coast so the air is pretty clean. Is it harmful and if so how do I get rid of it? I am not an experienced gardener and this is my first year of taking care of the garden!
21 May, 2015
Answers
So many different types of lichens its worth googling for more info.....its fascinating
21 May, 2015
Its best to post a photograph if you can for a more definitive answer, if you don't think its lichen.
21 May, 2015
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Lichen is an indication that the air where you live is very clean as it won't grown where the air is polluted. You don't need to get rid of as it won't harm the shrubs and trees.
21 May, 2015