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hi I've got clumps of moss on my driveway with a funny white and grey colour that sometimes changes colour. not sure what this is on the moss as never seen it before. is it harmful to people

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Its hard to tell precisely what the darker and whiter lumps are - to be honest, they look like cat or doggy doo as much as anything else. Even if it is a growing algae, moss, lichen or liverwort, they will not be dangerous to health, and a treatment which kills moss on hard surfaces should also take care of them, if they are living things.

17 Apr, 2016


I think the grey/white stuff is probably bird poo. certainly lots of cylinders of similar under the tree where the rooks perch.

17 Apr, 2016

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