A.C., Warren, Mich. Answer: There are several products designed to control moss and algae growth; however, most of these would also stain the porous stone wall. Copper sulfate, a good moss and ...

Stone walls can be found here and there in other ... in his neighborhood depend on it as a unique habitat. To lichens and moss, the wall’s dry stones are surfaces where plants can’t compete.

Almost 400 dry stone walls give Kiama's hinterland on the south coast of NSW a distinctive look and a link to the past, but there are growing concerns about whether the walls will survive for ...