Facts about Lawn Moss

Under its fuzzy green exterior, moss is a destructive pest. It spreads through lawns, choking out grass.
Invasion of moss generally occurs when turf grasses are weak. The best defense against moss (and other lawn problems) is a strong, healthy turf.
Moss has the ability to weather long drought periods by dehydrating. Moss can also grow at lower temperatures during winter than turfgrass.
Moss thrives in cool, mild climates where it prefers shady, wet areas where soil is compacted and acidic.
The first step to halting moss is to kill and remove it wherever it grows.
The best procedural approach with all moss control materials is first thorough coverage. Whether using a liquid or dry material, spread it all over the moss.
If your lawn has low pH, lime will improve the grass vigor to help fight off moss invasion.
If the turf is excessively mossy, there is much that can be done to remove it by physically dethatching. Up to 75% of moss can be removed by this method. The triple whammy approach is dethatching first, followed by iron application, and lastly a fertilizer application to encourage turf growth. A lawn can typically be turned around in one year with this method.
Caution: Iron will stain. Keep product off sidewalks, walkways, etc. Sweep granules off surfaces immediately. If rust stains appear on walks, etc., remove using a rust-stain remover (generally found in the plumbing section) .