But what’s that white stuff on mulch? Yes, that odd, spongy mass of white spores is actually a slime mold. But a slime mold isn’t actually a fungus in the sense of the word as we understand it.

While some studies have shown that white vinegar is capable of killing ... With this in mind, you can try using vinegar to eliminate the fungus on your mulch, but there is a chance it won't ...