Why moss and algae grow on coping stones

Name: Coping Stones UK
Address: Melton Mowbray, Leicestershire, LE13, GB
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Accepted Answer

Algae establish themselves first. They are microscopic single-celled organisms that form a thin, often invisible film on the stone surface before becoming the green or grey-green slick you can see with the eye. Once algae are present, they create the conditions that moss needs: a slightly moist, slightly acidic microenvironment on the stone surface.

How to Remove Moss and Algae from Garden Wall Coping Stones