The most common cause of moss in the lawn is a lack of fertility.
Because moss is not dependent on sunlight for photosynthesis it can thrive in shady areas where your lawn cannot.
Moss is able to grow in poorly drained, compacted and acidic soils.
Moss grows in sparse or thin areas of the lawn and lawns with excessive thatch.
The best defense against moss is a dense stand of turf. Here is how we do it:
Moss is ongoing so we add moss control to our fertilizer applications 3 times per year.
We spray Ferrous Sulfate (soluble Iron) so we can completely saturate the foliage rather than using a granular product that can only kill the area of moss the size of the particle being spread.
If the moss is excessive we can provide lawn de-thatching to remove the moss foliage and expose the small root like structures (rhizoids) and follow up with an additional moss control application 2 weeks after our first application.
We also provide lawn aeration to relieve soil compaction and a generous lime application
(25 lbs. per 1000 sq. ft.) to correct acidic soil conditions.
We over-seed sparse or thin areas with 3-way perennial ryegrass when we aerate or de-thatch a lawn for no charge.