Underlying Factors

• Moss can grow on top of soil that is lacking nutrients. Gardeners should supply fertilizer for the yard in the spring and fall to help discourage moss weed growth. Depending on the type of grass you are growing, you lawn may not be getting enough sunlight. Grass types such as bentgrass and St. Augustine grass perform well in shady areas. However, grass varieties like Bahia and Kentucky bluegrass will die out. You can increase the sun in the yard by pruning back overhanging trees or removing trees that are casting too much shade.
  
  

Killing Moss

• Apply a moss-killing product to the yard. Products that contain copper can be applied every other week, according to the University of Rhode Island website. Fall applications of moss control products are typically the most effective. Furthermore, the University of Rhode Island reports that cryptocidal fatty-acid soap can eradicate mossy weeds from the turf. It is important to apply these moss-control products according to the label, because they can harm your grass if applied too frequently.
  
  

Removing Moss

• Yards that have a moderate amount of dead moss can be raked. If your lawn is completely covered with moss, you can rent a dethatcher from a hardware store. A dethatcher cuts through the grass blade and rips up moss. Use the dethacher on a dry day to prevent injury to the grass. Burn or throw away the dead moss. Avoid placing the moss in your compost. Moss can spread throughout the yard if left in the compost.
  
  

Seeding Bare Areas

• Bare areas free of moss should be seeded to prevent moss or other weed seeds from germinating. Prepare bare areas by tilling the first 6 inches of topsoil. Broadcast your preferred grass seeds and cover them with an 1/8 of an inch of compost. Water the bare areas to promote grass seed germination. Monitor the lawn to ensure that moss doesn't come back and encroach on your newly planted seedlings.