Stinkhorn Fungi Around Maple: Harmless but Smelly

Those carrot-like fungi popping up around your maple tree and in wood chip mulch are stinkhorns—fascinating, harmless decomposers with a memorable odor.

What They Are

Stinkhorns are the fruiting bodies of fungi that break down dead organic matter. They "appear overnight" after rain in warm, humid conditions. The foul smell attracts flies that disperse spores. Common species include the dog stinkhorn (Mutinus caninus) and elegant stinkhorn (Phallus ravenelii).

No Threat to Plants

These fungi are saprophytic—they feed on decaying wood chips, roots, and organic debris, not living plant tissue. They don't cause tree decline. If your maple's leaves looked dying a week ago, that's a separate issue worth investigating (check for root stress, girdling roots, or verticillium wilt).

Simple Management

• Don't use bleach or boiling water—these harm soil biology and nearby plants
• Hand-pick or mow fruiting bodies when they appear
• Bag and dispose away from the house (the smell lingers!)
• Reduce excessive mulch depth (2-3 inches max)
• Improve drainage if area stays soggy

Stinkhorns indicate active decomposition—actually a sign of healthy soil biology. They'll naturally diminish as the woody mulch breaks down.