Mushrooms are not vegetables—they are fungi, a separate kingdom of organisms with their own biology and growth requirements. This distinction matters when you're deciding what to grow, how to cook it, and where to buy it. I’ve been growing gourmet mushrooms in South London for years, and understanding this difference has shaped everything from our cultivation methods to how we work with local restaurants and markets.
What’s the actual difference between mushrooms and vegetables?
Vegetables come from plants—roots, stems, leaves, seeds. Mushrooms come from fungi, a completely different kingdom. Fungi don’t photosynthesise; they break down organic matter to feed themselves. A mushroom is the fruiting body of a fungal organism, a bit like an apple is the fruit of an apple tree. The actual organism—the mycelium—lives in the substrate (soil, wood, compost, whatever we’re growing on) and spreads invisibly. The mushroom you see at market is the reproductive structure that pops up when conditions are right.
This isn’t just taxonomy. It changes how you grow them. Vegetables need light, air, and nutrients from soil. Mushrooms need moisture, the right temperature, humidity, and a food source (the substrate). When I’m designing a grow, I’m not thinking about sunlight or soil pH in the way a vegetable grower would. I’m thinking about substrate composition, fresh air exchange, and misting schedules. The biology is genuinely different.
Why does the culinary world treat mushrooms like vegetables?
In the kitchen, mushrooms function like vegetables. You buy them fresh, store them in the fridge, cook them raw or cooked, and they work in salads, stir-fries, and risottos alongside actual vegetables. Chefs use them to bulk out a dish, add umami, texture, and earthy flavour. Nutritionally, they’re low in calories, high in water, and full of fibre and minerals—the vegetable profile. So even though a button mushroom isn’t botanically a vegetable, it lives in your kitchen and on your plate like one.
This is why you’ll hear confusion at markets and in restaurants. A restaurateur asks me for ‘seasonal vegetables’ and expects mushrooms in that order, because that’s how they behave once they arrive. It’s a useful shorthand. But understanding the difference helps you cook better. Mushrooms don’t wilt because they lack water; they break down because fungi is decomposing. You store them differently, cook them differently, and they have their own growing seasons that don’t match spring cabbage or summer courgettes.
How does growing gourmet mushrooms differ from vegetable gardening?
This is where the distinction becomes practical. Growing gourmet varieties—oysters, shiitake, lion’s mane—requires completely different equipment and thinking than growing vegetables. You don’t need soil or garden beds. You need substrate (usually pasteurised straw, compost, or wood chips), inoculation with mushroom spawn (the fungal seed), bags or blocks, and a controlled environment. Temperature, humidity, and fresh air exchange matter far more than sunlight.
I grow small batches locally here in West Norwood in a way that’s far more compact and urban-friendly than vegetable gardening. I can produce gourmet mushrooms year-round in a space a vegetable grower couldn’t touch. The growing cycle is also faster—some varieties fruit within 3–4 weeks of inoculation, compared to months for tomatoes or peppers. This is why I’ve been able to build relationships with local restaurants and West Norwood Feast as a trader: I can supply fresh, consistent, gourmet mushrooms on a tight schedule, week after week.
If you’re interested in growing your own, I run cultivation workshops where you’ll learn the real process—substrate prep, inoculation, fruiting, harvesting. I also sell grow kits that handle the hard part for you: the substrate is already colonised with spawn, and you just provide the right environment (humidity, temperature, air) and the mushrooms fruit in your kitchen. It’s genuinely different from gardening, and that’s the appeal.
What does this mean for flavour and quality when you’re buying fresh?
Once you understand that mushrooms are fungi, not plants, you start to notice things about quality and flavour. Because mushrooms break down substrate to feed themselves, their flavour is shaped by what they’re grown on. A shiitake grown on hardwood has a deeper, more complex umami than one grown on straw. Lion’s mane has a delicate, almost seafood-like sweetness that varies with growing conditions. Oysters can be delicate or meaty depending on species and environment.
This is why I’m transparent about how and where I grow. I source locally where I can, keep batches small, and know exactly what substrate each variety is on. When I sell at West Norwood Feast or supply a local restaurant, I can tell you the story of that mushroom: what it was grown on, when it was harvested, how fresh it is. Vegetables have a similar story, but the timescale and the biology are different. A mushroom harvested this morning is genuinely a different product from one shipped in from a distant farm and sitting in a distributor’s cold store for days.
Understanding that mushrooms are a living, decomposing organism—not an inert plant—also explains why they need careful handling. They bruise easily. They breathe (respire) and need ventilation even in the fridge. They have a shorter shelf-life than most vegetables. But if you buy from a grower like me, who harvests fresh and local, that’s rarely a problem.
How does this distinction show up in community and education?
I run foraging walks and work with the Community Mycology Lab at Remakery Brixton and the South London Mushroom Club because mushrooms sit at the intersection of wild food, cultivation, and urban agriculture. That’s a unique position. When you forage for mushrooms, you’re hunting for the fruiting bodies of wild fungi—you’re not harvesting a plant and damaging its ability to grow again. When you cultivate them, you’re working with biology and substrate in a way that feels almost like fermentation rather than gardening.
This opens conversations about food systems, local production, and resilience that you don’t have quite the same way with vegetables. Mushrooms can grow on waste substrates—spent coffee grounds, straw, wood chips. You don’t need arable land or seasonal sun. In South London, where space and resources are precious, that matters. My workshops and talks are built on the idea that once you understand how fungi work, you can grow genuinely good food in places and seasons where vegetables simply won’t go.
The practical takeaway: does it matter if mushrooms are vegetables?
Botanically, the answer is no—they aren’t. Culinarily and nutritionally, they function like vegetables, and that’s fine. What matters is that understanding the difference makes you a better cook, a better grower, and a better eater. You buy mushrooms knowing they need different handling than a pepper. You cook them knowing their biology will behave differently under heat (they release water; they don’t brown like vegetables). You grow them knowing you can do it in an urban kitchen with zero soil or sunlight.
If you’re looking to buy fresh gourmet mushrooms, or you want to grow your own, get in touch. I supply restaurants and markets across South London, run workshops, and sell grow kits. I can also recommend foraged varieties if you want to understand wild mushrooms beyond cultivation. The point is: know what you’re buying and why. Mushrooms are brilliant, but they’re brilliant because of what they are, not in spite of it.