Moss & Algae Removal


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.

Step 1

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.

Step 2

Wait for the moss or algae to turn color. It will first turn yellow and then brown.

Step 3

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.

Step 4

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.

Tips and Warnings

  • For removal of moss from lawns, it is recommended to improve the drainage in the soil and apply a fertilizer to encourage grass growth, rather than use a removal product.

Things You'll Need

  • Moss and algae removal product
  • Stiff brush or pressure washer


  • Washington State University: Moss in the Landscape--Friend or Foe?
  • Bayer Advanced: 2-in-1 Moss & Algae Killer

Who Can Help

  • Ask the Builder: Removing Moss and Algae from Roofs
Keywords: remove moss algae, get rid moss, kill algae

About this Author

Sophia Darby is a former professional hairstylist who has spent the last six years writing hair-related articles for both online and print publications. Her work has appeared in Celebrity Hairstyles Magazine, as well as multiple websites.