Lawn and Turf: Moss
Photo by: G. Stahnke
Biology
Mosses are small, simple, non-flowering plants. They are typically low-growing and somewhat yellowish-green in color. They grow vigorously in the cool, moist weather of fall, winter, and spring, when lawn grasses are less able to compete.
Moss in lawns generally results from low soil fertility, high soil acidity, heavy shade, improper watering practices, diseased grass, poorly drained soil, compacted soil, or any combination of these. Permanent moss control depends on eliminating conditions which favor moss growth.
Management Options
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Non-chemical Management
Select non-chemical management options as your first choice!
- Maintain a vigorous, healthy lawn to prevent moss infestation.
- Provide proper fertilization and irrigation.
- Provide good soil drainage.
- Power or hand raking to remove moss will aid in control.
- Reduce shady conditions by pruning trees and shrubs.
- A soil test may be necessary to aid in correcting soil fertility or acidity. Your county extension agent or WSU Master Gardeners can recommend soil testing laboratories in your area.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Apply once the moss is growing most actively.
- Follow label instructions.
Approved Pesticides
If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.
Additional Image
Photo by: G. Stahnke
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.