Mushroom Weather

 It has rained for three days, and then, on the fourth, it stops, and the man who has agreed to take me into the woods looks at the sky with the quiet satisfaction of someone whose lottery numbers have come up. "Now," he says. "Now we go." I do not understand, at this point, why we could not have gone yesterday, or why the rain was apparently essential, or what precisely we are waiting for. I understand only that he is treating the weather the way a sailor treats a tide, and that I am about to be shown up, comprehensively, as a man who has never in his life known what the forest was doing.

We go the next morning, early, while the light is still grey and horizontal and the leaf-litter is soaked and the whole wood smells of something I can only describe as brown — wet earth and rot and fungus and last year's leaves breaking down into this year's soil. He moves slowly, scanning the ground with his head tilted, and within about four minutes he has bent down and come up with a porcino the size of a bread roll, fat and firm and faintly obscene, brushing the dirt off it with his thumb. It has taken him four minutes. I have been staring at the exact same forest floor and I have found, so far, a crushed drinks can and my own growing sense of inadequacy.

This is the thing nobody tells you about foraging. The mushrooms are there. They are absolutely there, often in plain sight. You simply cannot see them, because seeing them is a skill, and it is a skill that takes years, and standing next to someone who has it is a genuinely humbling experience, a bit like watching someone read a language you didn't know was written down.

The reason we waited for the rain — and then waited again after the rain — turns out to be the single most important fact about the entire business, and it is worth pausing on, because it quietly rearranges how you think about what a mushroom even is.

A mushroom is not really the organism. It is the fruit of the organism. The actual creature is the mycelium: a vast, fine, thread-like web that lives underground, or inside the wood of a rotting log, spreading through the soil sometimes for tens or hundreds of metres, entirely invisible, for years. What we call "a mushroom" — the thing you pick, the cap and stem — is merely the fruiting body that this hidden network pushes up into the air, for a few days, when conditions are right, in order to release its spores. You are not picking the plant. You are picking the apple. The tree is under your feet, enormous and unseen, and it has been there far longer than the mushroom you're holding, and it will still be there, waiting, long after.

Which is why the rain matters, and why the delay after the rain matters. The mycelium needs a good soaking to trigger the whole process, and then it needs a few days — three, five, sometimes a week — to absorb the water and push the fruiting bodies up through the soil. So the experienced forager does not simply go out when it's raining. He notes the rain, and then he counts. He waits for the wet to sink in and do its slow underground work, and then, on exactly the right morning, when the woods are damp and warm and the invisible network has finished its calculation, he goes. "Mushroom weather," they call it, all across Europe, in a dozen languages — that specific sequence of rain-then-warmth-then-wait that means the forest floor is about to produce. My guide had read it days in advance, the way you or I might read a clock.

There is an old belief that mushrooms spring up overnight, from nothing, as if by magic. It is one of those pieces of folklore that is wrong in the letter and right in the spirit. They do appear with startling speed — a bare patch of ground on Tuesday can be studded with caps by Friday. But they did not come from nothing. They came from the great patient creature underground that has been there all along, biding its time, waiting for the weather to tell it that now, at last, is the moment to show itself. The magic isn't the speed. The magic is the thing you never see.

Here is the part that fascinates me most, though, and it is not really about mushrooms at all. It is about people — specifically, about the fact that the very same forest, on the very same damp September morning, means completely opposite things to different Europeans.

To a Pole, or a Russian, or a Czech, or a Ukrainian, or a Finn, this wood is a larder. Mushroom-picking in the Slavic and Nordic world is not a niche hobby for enthusiasts; it is a mainstream national pleasure, a thing that whole families do together on autumn weekends, a core childhood memory for millions of people, woven so deep into the culture that it barely needs a name. The Czechs have a word, houbaření, for the activity of going mushrooming, and they pursue it with a devotion that shades, at the competitive end, into something close to a national sport — the whole country decanting into the forests when the weather turns, comparing notes on which slope produced first, guarding their best spots with the secrecy of a state intelligence agency. The Russian and Polish autumn weekend at the dacha or the country cottage very often means the forest, a basket, and coming home to spend the evening cleaning, drying, and pickling the haul. To these cultures, a wood full of wild fungi after rain is not a hazard. It is a gift, freely given, and only a fool would leave it lying there.

To the British, historically, the same wood has been a place of quiet menace. The English have been, for most of their history, magnificently and proudly mycophobic — suspicious of all wild fungi, convinced the lot of them are poison, content to eat a single cultivated white button mushroom and to regard everything growing wild in the woods as, at best, decoration and, at worst, death. Where a Pole sees dinner, the traditional Englishman sees a small pale thing that is probably plotting against him. There are actual scholarly terms for this divide — mycophilic and mycophobic cultures — and Britain has long been the textbook case of the latter, marooned on its mushroom-fearing island while half of Europe cheerfully harvested the forest floor. The French and the Italians, needless to say, are firmly in the mushroom-loving camp, which the Englishman abroad discovers with a mixture of admiration and deep suspicion the first time someone in Piedmont or the Périgord hands him a plate of something they picked themselves that morning.

I will not pretend to full membership of either tribe. I have inherited enough of the island wariness to be nervous, and enough envy of the Slavs to wish I weren't. Standing in the wood watching my guide fill his basket with a confidence I could not imagine possessing, I felt the whole cultural divide running right through the middle of me.

And it is worth being wary, because this is the one subject in all my summer of eating on which the stakes are genuinely, permanently serious, and I want to be plain about it rather than flippant. Some wild mushrooms will kill you. Not make you unwell — kill you, properly and irreversibly, sometimes days later when you thought you'd got away with it. And the deeply unfair part, the part that makes the whole endeavour something to approach with real humility, is that some of the deadly ones look a great deal like some of the delicious ones. This is not a field in which enthusiasm, or a good phone app, or a confident feeling, is any substitute at all for genuine expertise. The gap between "I'm fairly sure" and "I know" is, here, the gap between a wonderful dinner and a catastrophe.

Which is why the cultures that love mushrooms most are also, tellingly, the ones that have built actual public institutions around the danger — and I find this one of the most quietly civilised facts I know. Across much of Central Europe and Italy there are official mushroom-inspection services: you can take your basket to a qualified mycologist, at a public desk, and have your morning's haul checked, specimen by specimen, before anyone eats a thing. Italy's health ministry formally recommends exactly this — that privately picked wild mushrooms be examined by a mycologist before they go anywhere near a pan. In France there is the long, homely tradition of taking your basket to the pharmacist, who has been trained to know the difference and will, with a slightly stern expression, pick out and confiscate the ones that would have finished you. Think about what that means: entire societies that so love this wild food, and so respect how dangerous it is, that they have woven the checking of it into the public health system, staffed a counter for it, made it a normal Tuesday errand. A culture that says, in effect: yes, go, gather your wild dinner from the woods — but bring it here first, and let someone who truly knows take a look, because we would like you to still be with us next autumn.

The golden rule that sits under all of it is very simple and admits no exceptions: never eat a wild mushroom unless someone who genuinely knows has confirmed what it is. Not someone who's fairly sure. Someone who knows. Everything else in this piece is romance; that one sentence is the load-bearing wall, and every real forager I have ever met repeats it with the seriousness of a person who has seen why it exists.

With that said — and it needs saying — the reward at the end is one of the great tastes of the year. What happens to the haul is usually simplicity itself, because a good wild mushroom does not want much done to it: a sauté with garlic and parsley and a little oil; a plate of tagliatelle or pappardelle with porcini and nothing else clamouring for attention; a risotto that tastes of the whole damp forest in one spoonful. And because a good year gives you far more than you can eat — "more than you can eat" being the standard, slightly gleeful complaint of the successful forager — the glut is preserved the way gluts have always been preserved: the porcini sliced and dried, sometimes threaded on strings and hung up like strange pale garlands, concentrating into something even more intense than fresh; or cleaned and packed into jars with oil and vinegar, marinated and sealed for the winter. It is the same instinct I have watched all season — the passata bottled against February, the figs dried for the cold months, the grape must cooked down and kept — the autumn compulsion to catch the brief wild abundance and make it last. The forest gives everything at once, for a week or two, and then stops; you either capture it or you don't.

The porcino itself is part of why all this effort persists, because it is one of the great wild foods that has stubbornly refused to be domesticated. Unlike the button mushroom, which we long ago tamed and now grow by the ton in the dark, the true porcino will not be farmed; it depends on a living relationship with the roots of certain trees that we have never managed to reproduce to order. Which means that if you want it at its best, there is precisely one way to get it: someone has to go into the woods, on the right damp morning, and find it. It cannot be summoned. It can only be met.

I went home, that morning, with a nearly empty basket — one modest porcino I'd genuinely found myself, which my guide inspected and pronounced good with the air of a teacher marking generous partial credit, and which I ate that night with more pride than any mushroom has ever deserved. The rest of my winter porcini, I will buy, dried, in a small expensive packet, and I will not be ashamed of it.

But I keep thinking about what that morning actually was. All summer I have written about food that comes from the land — the apricot orchard, the fig tree in the wall, the tomato bottled in the courtyard, the grapes brought in at dawn — and every single one of those is a form of growing. Agriculture. Things we plant, and tend, and harvest from ground we control. The mushroom in the wood is something older than all of it. Nobody planted it. Nobody tends it. It answers to no farmer and keeps no schedule but its own, and to get it you do the single oldest thing our species has ever done for its dinner: you walk out into the wild, and you look, and you find. Farming is perhaps ten thousand years old. Foraging is as old as being human. For one damp September morning, basket in hand, squinting hopelessly at a forest floor I could not read, I was doing exactly what every one of my ancestors did before the first seed was ever deliberately planted — and the mushroom, that brief fruit of the hidden underground creature, was the last genuinely wild thing I would put on a plate all year.

Back in the spring, I started all this in a green lane, marvelling at elderflowers foaming in a hedgerow — a small wild thing I could gather with my own hands at the very edge of the tame world. It seems I have spent the whole long summer walking, without quite meaning to, from that hedgerow into the deep woods, and from one wild-gathered thing to another. The elder gave itself up easily, at the roadside, to anyone who reached. The porcino made me come all the way in, and get up early, and get rained on, and admit how little I could see.

That feels about right, for the last of it. The wild doesn't owe us an easy dinner. Now and again, if we pay attention and wait for the weather and go in with a basket and enough humility to ask an expert before we eat — it feeds us anyway.