Homeowners often find brightly colored mold in their gardens or yards. Molds growing on soil are known as slime molds, and they are most commonly seen during prolonged periods of wet, humid weather. This type of mold does not harm plants or feed on plant tissue, and it typically disappears when rainy weather ends.
Slime molds are organisms that feed on the soil's organic matter, such as bacteria and yeast. During their reproductive stages, slime molds feed on vegetation. Spores from slime molds often blow onto sidewalks, driveways and plants in close proximity.
Slime molds on garden soil may be a variety of colors. These molds often are green or yellow but also can be pink, white or orange. Some slime molds closely resemble dog vomit and are aptly named "dog vomit" mold. Heavy coverings of mold may reduce the amount of sunlight to plants underneath it.
Slime molds are most prevalent in the summer months and usually disappear on their own. However, certain factors can reduce the likelihood of slime mold development. Poor drainage promotes slime mold development. Avoid using water to rinse slime mold away during periods of humid, wet weather, as this encourages growth.
Slime molds do not necessarily require control methods. However, some homeowners do not care for the sight of green mold on their soil or lawn. Raking the mold from the soil and discarding it can eliminate slime mold. Slime mold on grassy areas can be removed with mowing. Spraying a forceful jet of water from a garden hose also can remove slime mold, but this practice is recommended only in dry weather. There are no chemical controls recommended for the removal of slime molds. They will disappear in their own time, even if the homeowner takes no action.