What Is the Red, Smelly Thing Growing in My Backyard?

Have you ever stepped into your yard one morning and spotted something bright red-orange sticking up from the mulch?

At first glance, it might look like a tiny alien, a piece of coral, or something that definitely doesn't belong in an ordinary garden.

And then you get closer.

That's when you notice the smell.

If you've discovered a bright red-orange fungus that appeared almost overnight, you may be looking at a red stinkhorn mushroom. These unusual fungi are famous for their bizarre shapes, surprisingly rapid appearance, and an odor that can be downright unpleasant.

But here's the interesting part: while stinkhorns can look alarming, they're often simply doing what fungi do best—breaking down organic material and helping recycle nutrients in the garden.

Still, identifying the exact species from a quick backyard glance isn't always easy. And when someone says a mushroom is “safe,” it's important to understand what that actually means.

Let's take a closer look at how to recognize a red stinkhorn, why it smells so bad, and what you should do if one appears in your yard.

What Is a Red Stinkhorn Mushroom?

A red stinkhorn is a type of fungus belonging to a group commonly known as stinkhorns. Several species in the genus Mutinus have slender, upright fruiting bodies that range from reddish-orange to pink or coral.

Unlike the familiar cap-and-stem mushrooms you might see growing in a lawn, stinkhorns often have unusual shapes. Some resemble narrow fingers, pointed horns, or elongated sponges.

They may appear in garden mulch, compost, leaf litter, decaying wood, or other places where organic material is breaking down.

The fungus itself may have been developing in the soil or mulch for some time before the visible structure appeared.

Then, seemingly overnight, there it is!

That sudden appearance is one reason stinkhorns attract so much attention from homeowners.

How to Identify a Red Stinkhorn Mushroom

Several visual clues can help you determine whether the fungus in your yard might be a stinkhorn.

However, appearance alone may not be enough to identify the species confidently.

1. A Bright Red-Orange or Pink Stalk

Many red stinkhorns have a narrow, upright structure with a vivid red, orange-red, or pinkish color.

The stalk may be tapered, spongy, or slightly irregular rather than firm and woody.

Some species grow like little horns, while others look more like thin, elongated fingers.

2. A Dark, Slimy Tip

One of the recognizable features of certain stinkhorns is a darker, sticky coating near the tip or along part of the fruiting body.

This material contains spores and is often called the spore slime, or gleba.

Its appearance and location vary among species, so not every red stinkhorn will look exactly alike.

3. A White, Egg-Like Base

Some stinkhorns emerge from a rounded, whitish structure commonly called an egg.

As the fungus develops, this outer covering breaks open, allowing the stalk to emerge.

You may notice a white, sac-like base around the bottom of the mushroom, although it can be partly hidden beneath mulch or soil.

4. A Strong, Unpleasant Odor

The smell is often the biggest giveaway.

Many stinkhorns produce a powerful odor that people compare to rotting meat, sewage, or decaying organic matter.

The intensity varies by species and stage of development, but the smell can be surprisingly strong for such a small fungus.

Important: These clues can suggest a stinkhorn, but they aren't enough to confirm the exact species. If identification matters, take clear photographs of the entire fungus, including its base, and consult a local mushroom identification expert.

Why Does a Red Stinkhorn Smell So Bad?

Here's where the name makes perfect sense.

Many stinkhorns produce an odor that attracts flies and other insects that visit or feed on decaying organic material.

To us, the smell may be disgusting. To certain insects, however, it can resemble a promising food source.

When flies land on the fungus, they may pick up spores from its sticky surface. As they move elsewhere, they can transport those spores, helping the fungus reproduce and spread.

This is a clever biological strategy.

Instead of relying only on wind to disperse its spores, the fungus uses insects as tiny delivery services.

In other words, the unpleasant smell serves a purpose: it helps the fungus reproduce.

Nature doesn't always have to smell pleasant to be remarkably effective!

Why Did a Stinkhorn Suddenly Appear in My Garden?

If you've never seen one before, you might wonder whether something has changed in your yard.

The answer is often simpler than you think.

Stinkhorns commonly grow where organic matter is decomposing. Garden mulch, rotting wood, fallen leaves, compost, and other plant debris can provide suitable conditions.

Several factors may contribute to their appearance.

Moisture and Warm Weather