Why a lovely forest has no mushrooms: 7 reasons and what to do

A lovely forest can be empty for several reasons: the trees are still too young for the "grown-up" mushrooms, the soil beneath them is dry sand, grasses have taken over the ground, the forest is trampled, or it has just been through a drought. The mushroom we pick is only the fruit of the mycelium, and the mycelium lives in partnership with tree roots and is very fussy about moisture. So a forest that is beautiful to us and a forest that suits a mushroom are two different things.

This autumn we photographed several forests like that: young pine and birch plantations, bright woodland edges and trails, mostly in September and October 2026, and not a single mushroom in the frame. We've added a few shots from summer walks too. Below, we try to work out why this might have happened.

Lovely forest, empty basket: what our photos show

At the end of September we walked through a young mixed wood, with slender birches growing among young pines. Low shrubs and fallen leaves underfoot, bright and quiet, and not so much as a brittlegill.

Next to it, young pines grow in dense clumps, with a birch in yellow leaf among them. The forest is bright and lovely, but the trees are still short, and that's the first clue.

Forest age: mushrooms arrive in turns too

Most of our favorite forest mushrooms are mycorrhizal: their mycelium wraps around a tree's fine roots, takes sugars from it and gives back water and minerals. The make-up of these partner fungi changes as the trees age. In the early 1980s, British mycologists working in birch plantations divided them into "early" and "late" fungi. Early ones, such as Hebeloma, deceivers (Laccaria) and fibrecaps (Inocybe), readily colonize the roots of young trees. Late ones, among them birch boletes, milk caps and fly agaric, hardly ever took hold on seedlings in ordinary soil in the experiments. Yet birch boletes and milk caps readily settled on seedlings planted next to the roots of a mature birch, which "feeds" their mycelium.

Put simply, a very young forest mostly grows "early" mushrooms, which are small and of little interest for the basket, while the big mushrooms we know haven't yet had time to move in.

For porcini, Spain has some interesting long-term observations. Mushrooms were collected there for ten autumns in a pine forest with plots of different ages. Most porcini came from the plot with 51–70-year-old pines, while the saffron milk cap fruited best among 16–30-year-old pines and among the oldest ones. So a young forest isn't a lost cause: saffron milk caps can even be plentiful there, but you'll usually find fewer porcini than in a mature forest.

We took this shot in an older pine wood with birches in early October. The trunks are taller and the forest more open, but we found no mushrooms here either, so age is only one of the reasons. For how the age of a pine forest affects whether you'll find porcini or bay boletes, see our article which mushrooms grow in a pine forest.

Overcrowded plantations

Young pines are often planted close together. It's dark between them, the lower branches die off, and the ground is covered with a layer of needles, with almost no grass or moss.

Does "denser" mean "fewer mushrooms"? Spanish yield models for pine forests show that mushrooms are most abundant at a particular stand density: a sparse forest yields less, and so does one that's too dense. Rainfall has the biggest effect on the harvest of all. So an overcrowded young stand isn't a dead forest, but it isn't the best place for your basket either.

Grasses instead of moss

Along the edges of young pine woods we saw solid stands of dry grass. Pretty, especially in the evening sun, but for a forager it's a bad sign.

Grasses form a completely different type of mycorrhiza from pines and birches, so slippery jacks and porcini have "nothing to negotiate" with them. Dense turf also takes up water from the top layer of soil, and a mushroom in thick grass is easy to miss even if it's there.

In a meadow it's even clearer. There are no trees in the middle of a grassy clearing, so there are no partners for mycorrhizal mushrooms. However lovely the clearing, looking for porcini there is pointless.

Dry sand and water deep down

Pine grows where other trees find it too dry and poor, which is why pine forests often stand on sand. Sand drains water quickly, and the top layer dries out after a few sunny days.

American researchers found that in a drought, mushrooms partly draw water from deeper than 30 centimeters, or from water brought up by tree roots. On dry soil this accounted for anywhere between a quarter and 80 percent of their water. So a mushroom can live on water borrowed from a tree, but a rich harvest needs moisture near the surface too.

Drought: the forest remembers a month of rain

The most common reason for an empty forest isn't the forest itself but the weather over the previous few weeks. This is what a forest looks like after weeks of heat: the grass along the trail has burnt to straw. We took this shot in early August.

German researchers counted porcini every day in a beech forest for ten years. Mushrooms came up best when the average temperature over the previous 20 days stayed around 13 °C, and the harvest grew with the total rainfall over the previous 26 days. So a single rain yesterday decides little: what matters is how much water the forest has had over the last three to four weeks. There's more on this in our articles mushroom drought, when to go mushroom hunting after rain and how much rain mushrooms need.

Trails and trampling

A forest by a road or a popular trail is another trap: the spots most pleasant for a walk are usually the most trampled.

In Switzerland, scientists spent almost thirty years tracking how picking affects the harvest, and ran a separate ten-year experiment on trampling. Picking didn't reduce future harvests. Trampling, though, cut the number of fruiting bodies by about 30 percent, most likely because feet destroy the young mushroom primordia. The mycelium itself was hardly harmed by trampling. So step at least a few dozen paces off the trail.

Nitrogen: the invisible reason

There's also a reason you can't see. Nitrogen from exhaust fumes, farms and fertilizers settles on the forest from the air. In a Swiss experiment in a spruce forest, just a year after nitrogen was added, both the number of fruiting bodies of mycorrhizal fungi and their species diversity dropped sharply. And in the Netherlands, after nitrogen emissions were cut, nitrogen-sensitive mycorrhizal fungi began to come back.

Nettles under trees are a classic sign of nitrogen-rich soil, and lush grass loves nitrogen too. In this May shot there's thick green grass under the birches and pines, but that doesn't mean there are lots of mushrooms here. We don't know whether our particular forests have excess nitrogen, so we're not claiming it: just remember that a forest near fields and roads may be poor in mushrooms for this reason.

Signs of a mushroomy forest

Now for the good news. Here's what we've learned to look for.

• Moss. Green cushions of moss hold moisture and show that the ground here does not dry out.
• A litter of leaves and needles, not a solid turf of grasses.
• Mature trees. A middle-aged or older pine wood, a birch wood where the birches already have thick trunks.
• Woodland edges and boundaries between pine and broadleaf trees.
• Hollows and shady slopes, where moisture lingers longer.
• Away from the trails.

Moss at the foot of a tree in a shady forest is a good sign of moist soil. We took this shot in June in a broadleaf forest.

In early October we came across a small mossy clearing in a mixed forest, with a fallen birch and fallen leaves. A place like this is worth walking through slowly and carefully.

Here, under the pines and birches, solid grass gives way to moss mixed with leaves. This is the kind of litter we're looking for. To be honest, there were no mushrooms here that day either. The signs raise your chances, but they don't replace rain.

Edges with old, spreading pines are worth checking too. On that same evening, 3 October, when we saw the empty grasses, we found boletes exactly where small broadleaf trees mixed in with the pines. More on that in our photo diary from a young pine wood.

A mixed forest with pine, birch and oak offers mushrooms more partners than a single-species plantation. If there's one next to a uniform pine wood, start there.

In short: what to do if the forest is empty

1. Look at your feet: grasses and bare sand, move on; moss and leaves, stay a while.
2. Judge the age of the trees and look for older patches or woodland edges.
3. Think back over the weather for the past month, not just yesterday's rain.
4. Step away from the trails.
5. Before you head out, check the conditions with the mushroom radar.