Moss is a problem in lawns when growing conditions are not suitable for grass. Moss and grass have different requirements.

Excessive shade, poor drainage, and low fertility retard or inhibit grass growth but encourages moss growth. The causes of poor conditions must be removed before the moss problem can be permanently corrected.

If trees or shrubs cause shading, they must be pruned back or thinned to let more sunlight through.

Rerouting run-off water, installing gravel or tile drainage beneath the lawn and raising low spots with topsoil will improve drainage.

Aerating each year will help alleviate poor drainage and soil compaction.

Grass growth can be further encouraged by adding the correct fertilizer and limestone.

Ordinary weed killers will not control moss. There are, however, commercial moss control materials on the market that will help to discourage the moss.

Heavy infestations of moss, where the grass has disappeared, should be raked out and re-seeded or re-sodded.