Ravenel's Stinkhorn Is Peaking This October — Here's What to Do

If you've wandered out to your mulch bed recently and caught a stench you couldn't quite place, you may have already met Phallus ravenelii — Ravenel's stinkhorn. This distinctive fungus is entering peak activity across much of the eastern and midwestern United States right now, and October is shaping up to be a prime month for sightings. Whether you've found a cluster of pale "eggs" poking out of your wood chip mulch or traced an unmistakable odor to its source, this guide will help you understand what you're dealing with and what to do about it.

Check our seasonal forecast for the latest regional activity updates.

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Why October Matters for Ravenel's Stinkhorn

Ravenel's stinkhorn follows a typical activity window that spans February through June and again September through November — making fall one of its two most active periods of the year. October sits squarely in that second surge. As temperatures moderate and moisture from autumn rains accumulates in mulch and organic debris, conditions become ideal for stinkhorn fruiting bodies to emerge seemingly overnight.

The fungus lives in and feeds on decomposing organic matter — wood chips, bark mulch, buried wood, and rotting roots are all fair game. With many homeowners laying fresh mulch in the fall and leaf litter beginning to accumulate, there's often plenty of new food source material available just as the fungus is primed to fruit. Don't be surprised if you see a new specimen appear nearly every day during an active stretch.

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What to Look for Right Now

Ravenel's stinkhorn has a memorable and hard-to-miss profile. Here's what to watch for this month:

• Stinkhorn "eggs": The fungus first appears as whitish or pale, egg-shaped structures partially emerging from the soil or mulch surface. These may cluster together and can appear in groups.
• Fruiting bodies: Eggs rupture to reveal the mature stinkhorn, which has a spongy stalk topped with a dark, olive-brown cap covered in a foul-smelling slime called gleba.
• The smell: Many people smell it before they see it. The odor is often described as rotting flesh or carrion — this is by design, as the stench attracts flies that disperse the fungus's spores.
• Location: Look in mulched beds, wood chip piles, areas with buried wood, and anywhere decomposing organic material is present.

Symptoms on surrounding plants are generally not a concern — this fungus is a decomposer, not a pathogen of living plants.

Not sure what you're seeing? Try our diagnosis tool to get a clearer picture.

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Where It's Active

This month, Ravenel's stinkhorn has been reported as active across a wide swath of the country, including Florida, Georgia, South Carolina, North Carolina, Maryland, Virginia, Pennsylvania, New Jersey, Connecticut, New York, Massachusetts, New Hampshire, Maine, Illinois, Indiana, Michigan, and Minnesota. If you're in any of these states, keep a close eye on your mulched landscape beds.

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What to Do This Month

Ravenel's stinkhorn is rated moderate in severity. It won't kill your trees or shrubs, but it can be a nuisance — especially given the odor — and heavy infestations in high-traffic areas may warrant action. Here's your October action plan:

1. Sanitation First Remove the eggs and fruiting bodies as soon as you spot them — ideally before they fully open and release spores. Place them in a sealed bag and dispose of them in the trash. This won't eliminate the fungus from the soil, but it can help reduce the number of fruiting bodies and limit odor. Do not compost them.

2. Manage Your Mulch and Moisture Ravenel's stinkhorn thrives in persistently moist, organic-rich conditions. This fall, avoid overwatering mulched beds and ensure your landscape has proper drainage. Consider pulling back mulch layers that have become waterlogged. Applying a thinner, well-aerated mulch layer can help reduce the habitat this fungus prefers.

3. Consider a Fungicide if Needed If the infestation is persistent and affecting a high-use area, a systemic or contact fungicide applied at first sign of activity may help suppress fruiting. Repeat applications are often necessary during wet weather. Always follow label rates and timing carefully. Note that fungicides treat symptoms, not the underlying mycelium in the soil.

4. Sterilize Your Tools If you're digging around affected areas, sterilize any tools afterward to avoid inadvertently spreading fungal material to other parts of your property.

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When to Call an Arborist

For most homeowners, Ravenel's stinkhorn is a manageable nuisance. However, consider reaching out to a certified arborist if:

• You're seeing extensive, recurring infestations across your property and aren't sure of the source
• You're concerned that buried rotting wood or root decay may be fueling the fungus near a valued tree
• You want a professional to assess whether declining mulch conditions are contributing to broader plant health issues
• You're unsure whether what you're seeing is truly stinkhorn or something else requiring treatment

An ISA Certified Arborist can walk your property, assess the situation, and recommend a targeted management plan. Find an arborist near you to get started.

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Ravenel's stinkhorn is one of nature's more theatrical fall visitors — dramatic, smelly, and surprisingly fleeting. With a few simple steps this October, you can manage it effectively and keep your landscape healthy through the season. For the full species profile, visit our Ravenel's stinkhorn detail page.