Mosses and algae are nonparasitic, broadleaf plants that do not harm other plants, but rather fill-in where growing conditions, such as excessive shade, poor drainage or low soil pH, prevent lawns and landscape plants from thriving. They can also grow on shady or wet walls, roofs, decks, siding, and paving, becoming unsightly and/or a slippery hazard.

In general, mosses are dense, low growing plants with threadlike stems and very tiny leaves. Algae create a more dense, slimy coating that turns black when dry, often forming a hard crust on the soil that makes watering difficult.

Mosses and algae can be controlled on open soil, hardscapes and structures with Natria Grass & Weed Control with Root Kill. However, it is a broad-spectrum herbicide and should not be allowed to come in contact with desirable plants (link how to protect plants when using herbicides) or lawn grasses. To control mosses, algae, lichens (a composite, symbiotic plant made up of certain algae and fungi) and moss-like liverworts in lawns, use Natria Lawn Weed & Disease Control.

Where Moss and Algae are found Geographically
Common throughout the United States.

Similar or Related Plants
Lichens. Liverworts.


Cultural Controls

It will help to correct conditions that favor the growth of mosses and algae, including pruning trees to allow the penetration of more light, improving drainage and adjusting irrigation, fertilization and soil pH to a neutral(6.5-7.0) level.