By Stamatula
County Tyrone,
United Kingdom 
I have various varieties of young trees, cherry blossom, mock orange,
varigated poplars and although they grow and bloom each year so far
the trunks and branches are covered in a green coloured moss substance.
Will this harm them?
23 Mar, 2010
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No - its an indicator of clean air and damp conditions.
23 Mar, 2010