Moss and algae seek moist and cool conditions to grow in. They are often found in shaded lawns, roofs with little sun exposure and sidewalks and decks that are in moist, shaded areas of your yard. Growth of moss and algae can become a slipping hazard if allowed to flourish on walkways, patios and stairs, so immediate removal is recommended. While there are moss and algae removal products on the market that contain iron, these are not recommended for patios and concrete as it will stain. Look for a removal product containing potassium salts of fatty acid instead.
Apply a moss and algae removal product directly onto the moss or algae, following the product directions. It is recommended to spray the moss and algae in the spring and fall when it is actively growing.
Wait for the moss or algae to turn color. It will first turn yellow and then brown.
Remove the moss or algae from the surface once it has turned brown and completely died off. Use a stiff brush or pressure washer to remove it.
Repeat the application if the moss or algae returns. Typically, an application of a removal product should keep the moss and algae away for several months to one year.