Black Spots On Siding From Mulch

Add a fresh layer of mulch.

Black spots on siding from mulch.

Plant a low maintenance groundcover in the area instead of using mulch. They are raised hard bumps. The tiny dots are caused by what s called artillery fungus that grows in certain types of mulch. Although it s most often found on the east coast it can grow anywhere and especially thrives in areas that have cool damp springs or rainy fall weather conditions.

If you notice lots of tiny black or dark brown spots developing on your siding above a landscaped area of your yard as seen below it is most likely artillery otherwise known as shotgun fungus. Artillery fungus is a wood dwelling fungus commonly found in mulch. The artillery fungus is a white rotting wood decay fungus that likes to live on moist landscape mulch. Some tell us it s from spiders.

Use big pieces of pine bark or other bark mulch which are a less hospitable place for the fungus. What are these black spots on your house siding. Others have said it s a fungus from mulch. Replace wood mulch with landscape fabric and small stones.

Davis of penn state. It s sometimes referred to as shotgun fungus due to the shotgun like pattern of black specks all.