Finding odd growths in your backyard can be unsettling—especially when dark, finger-shaped forms push up through garden mulch. While they may look alarming at first, these unusual structures are usually a harmless fungus commonly known as Dead Man’s Fingers. Once you know what they are, concern often gives way to fascination.

Dead Man’s Fingers, scientifically named Xylaria polymorpha, is a wood-decomposing fungus that grows on rotting organic matter. It often appears in clusters, emerging from buried logs, old tree stumps, or mulch rich in wood debris. The growths are typically black or deep brown, narrow, and elongated, resembling fingers reaching out of the ground. In their early stages, they may look paler before darkening and becoming hard and woody as they mature.

This fungus prefers moist, shaded environments where decaying wood is plentiful. Garden beds filled with wood chips provide ideal conditions, and increased moisture during cooler or rainy seasons can trigger its growth. Despite its eerie appearance, Dead Man’s Fingers poses no threat to healthy plants, animals, or people. In fact, it serves an important ecological purpose by breaking down dead wood and recycling nutrients back into the soil.