The Stinkhorn Egg: What Is That Foul-Smelling Thing Growing in Your Garden?
Imagine stepping outside on a quiet morning, ready to tend to your garden, only to be stopped in your tracks by an overwhelmingly foul odor — something so putrid it catches in your chest and leaves a strange metallic taste on your tongue. You look down, and there in the grass sits something that looks almost alien: a pale, egg-shaped object wrapped in a semi-transparent membrane, with vivid pink or red structures beginning to emerge from within. What on earth is it?
What you are most likely looking at is a stinkhorn egg — the early developmental stage of a stinkhorn fungus, most commonly from the species Clathrus ruber (the latticed stinkhorn) or a close relative. While alarming in appearance and absolutely offensive to the nose, this strange garden visitor is more fascinating than dangerous. Here is everything you need to know about it.
What Exactly Is a Stinkhorn Egg?
Stinkhorn fungi begin their life cycle as subterranean, egg-like structures. These eggs are encased in a tough, rubbery outer skin called a peridium, beneath which the immature fruiting body develops. When conditions are right — typically after rain or in moist, warm soil — the egg splits open and the adult fungus expands rapidly, sometimes within just a few hours. The pink or red latticed or finger-like structures you see emerging from the cracked egg are the early stages of the fully formed fungus pushing its way out into the world.
Why Does It Smell So Terrible?
The stench is not accidental — it is a brilliantly evolved survival strategy. Once fully mature, stinkhorn fungi produce a dark, slimy substance called gleba on their surface, which carries the fungal spores. This gleba smells powerfully of rotting flesh, decay, or raw sewage. The odor is designed to attract flies, beetles, and other insects that feed on carrion. These insects land on the fungus, pick up the spores on their bodies, and carry them elsewhere, effectively dispersing the fungus across a wide area. Even at the egg stage, a faint but detectable odor can already be present, which explains why the smell can hit you before you even spot the source.
Is It Dangerous to Humans or Pets?
Here is the good news: stinkhorn fungi, including their eggs, are not toxic to humans. In fact, the eggs are considered edible in some parts of Europe and Asia, where they are occasionally sliced and eaten raw or cooked. However, the taste is as unpleasant as the smell, so culinary interest in them remains very limited. For pets — particularly cats and dogs — stinkhorns are generally considered non-toxic as well, though consuming large quantities of any wild fungus is inadvisable and a veterinarian should always be consulted if a pet has eaten one.
Where Do They Come From?
Stinkhorns thrive in gardens, lawns, wood chip beds, compost areas, and anywhere there is decaying organic matter buried in or near the soil. They are not a sign of poor garden hygiene — in fact, they indicate that your soil is rich in organic material and home to a healthy fungal network. The mycelium (the underground thread-like body of the fungus) can spread quietly underground for years before producing visible fruiting bodies above the surface.
Should You Remove It From Your Garden?
If the smell is bothering you or you simply do not want stinkhorns growing in your garden, you can remove the eggs before they open. Use gloves and place them in a sealed bag before disposing of them. Once the fungus has fully opened and released its spores, removal is largely pointless from a containment standpoint, as the spores will already have spread. Some gardeners choose to leave them alone, appreciating the role they play in breaking down organic matter and enriching the soil ecosystem.
Tips for Managing Stinkhorns in Your Garden
- Always wear gloves when handling stinkhorn eggs or mature fruiting bodies.
- Remove eggs early, before they open, to prevent spore dispersal if you wish to limit their spread.
- Reduce wood chip mulch or other decaying organic matter near the affected area to discourage future growth.
- Do not use fungicides — they are largely ineffective against stinkhorns and damage the wider soil ecosystem.
- Wash your hands thoroughly after any contact with the fungus.
- Keep children and pets away from the area until the fungus has been removed or has naturally decomposed.
A Strange but Remarkable Part of Nature
As shocking and unpleasant as discovering a stinkhorn egg in your garden can be, it is worth pausing to appreciate just how extraordinary these organisms are. In a matter of hours, what looks like a leathery egg transforms into a striking, sculptural fungus that has evolved over millions of years to exploit the behavior of insects for its own reproduction. Your garden, it turns out, is home to a world far stranger and more complex than it appears on the surface. The next time the smell hits you, try to hold your breath long enough to take a closer look — from a safe distance, of course.
