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Unexpected white growth on soil is likely harmless fungi
Recent fall rains are making harmless fungi more visible in wood mulch, and most growth disappears when the mulch surface is cultivated, NDSU says.
Recent fall rains have increased the incidence of surface fungi on wood mulch, according to NDSU Extension-Cass County, which is fielding questions about managing the growths in perennial beds.
Don Kinzler, NDSU Extension-Cass County horticulturist, explains these white fungi growths are typically harmless to perennials and beneficial; they decompose organic material into nutrient-rich soil.
For those noticing the growth, Kinzler advises that cultivating the surface, or "fluffing up" the wood mulch, usually makes the visible fungi disappear.
As grass continues growing, Kinzler recommends maintaining a mowing height of 3 to 4 inches, with final height reducible to around 2 inches once dormancy approaches.
Although winter weather remains uncertain, Kinzler suggests dormant seeding remains a viable strategy for repairing drought-injured lawns in late November.