Moss thrives in cool, damp areas that lie in shade for most of the day. Having no true root system or stems, moss instead produces layers of small leaves that give a green tint to everything they cover. Brick sidewalks are often prone to moss growth, as the bricks hold onto dampness and remain cool in shady areas. Killing the moss without damaging the brick or harming neighboring plants requires time and care.
Combine 1 part household bleach with 5 parts cool tap water. Pour the bleach solution into a spray bottle that is only used for this purpose.
Spray the bleach solution onto the moss-affected areas of the brick. Avoid getting bleach on the neighboring desirable vegetation. Spray the moss daily until it is dead.
Rinse neighboring vegetation with water after each bleach treatment. Rinsing dilutes any bleach spills and helps minimize damage to plants.
Power wash the brick walkway once all the moss is dead to remove the dead moss from the bricks.