Moss is a typical lawn care problem associated with shady conditions. Other causes of moss invasions, in addition to excessive shade, include compacted soils, poorly drained soils, low soil fertility, low soil pH, and poor air circulation. Moss thriving in lawns signals that grass is weak and has thinned for some reason, allowing the moss to take over.

Poor lawn care practices are another source of moss problems. General lack of care, including irregular mowing and little or no fertilizer applications are common problems leading to poor turf growth.

Adding limestone is a common "remedy" mentioned for moss control. It is highly recommended to test the soil to determine the pH level. Many soils St. Louis lawns tend to have a low pH values; adding limestone is a prerequisite to correct the situation. Ferrous ammonium sulfate ("Moss B Gone" by Fertilome) or ferric sulfate (iron sulfate) can be used to control moss to some extent. The moss will temporarily burn away, but tends to return fairly quickly. Raking out the moss with a hard rake is another option; usually followed by reseeding.

Modifying site conditions to favor lawn grasses and discourage moss is a suggested way to manage the problem. Too much shade for acceptable grass growth is a common underlying cause for moss invasion. Pruning trees and shrubs to improve air circulation and light penetration is a good starting point. Evaluate the site to assure the proper grass for the conditions is being used.

Take a good look at the soil conditions. A soil test can be helpful, as it could be the soil pH is out of line, contributing to the problem. Reduce soil compaction by core aerifying. This may also help correct drainage problems; although serious drainage problems may require more extensive work to correct. For additional information

Evaluate lawn care procedures, especially fertilizing, and adapt to the conditions, such as shade, as mentioned earlier. Lawns need adequate fertility, in particular nitrogen, but less in shade. Additional information about fertilizing.

Excessively short mowing may be a source of the moss problem; a range of two to three inches is ideal for most lawn grasses. Mow on a regular basis (based on rate of lawn growth) to avoid removing more than one-third of the leaf blade. Also avoid excessive watering, as this may contribute to moss problems. Water deeply and as infrequently as possible, based on lawn needs.

Sometimes its better to start from scratch and literally remove the entire moss area, add limestone, and renovate the entire area. This process is labor intensive but renovation will produce the best results.

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