Mushrooms are not vegetables; they’re fungi with their own kingdom, lacking roots, seeds and chlorophyll that define plants. Understanding this distinction matters for cooking, growing and sourcing. At Adi’s Urban Mushrooms in West Norwood, we grow gourmet fungi alongside the community to celebrate what makes them distinct — and delicious.
What is a mushroom, botanically speaking?
A mushroom is the fruiting body of a fungus, not a plant. Fungi occupy their own biological kingdom, separate from plants, animals and bacteria. Unlike vegetables — which are edible parts of plants like leaves, roots, stems or seeds — mushrooms have no roots, no seeds and no chlorophyll. Instead, they grow from mycelium, a thread-like network that spreads through soil, compost or wood, breaking down organic matter and absorbing nutrients. The mushroom cap and stem you harvest are simply the reproductive structure, equivalent to a fruit on a plant.
This distinction shapes how mushrooms behave in the kitchen and the garden. Because they don’t photosynthesise, they thrive in darkness or shade. Because they feed on decomposing material rather than manufacturing their own nutrients, they grow quickly on spent coffee grounds, straw, logs or sawdust. When I grow oyster mushrooms or shiitake for restaurants and markets in South London, I’m working with this biology, not fighting it. That’s why gourmet growers can produce fresh fungi in urban spaces where vegetables would struggle.
How do fungi differ from vegetables in the kitchen?
The difference between mushrooms and vegetables becomes practical the moment you start cooking. Vegetables — carrots, broccoli, lettuce — are plants, so they contain plant cell walls made of cellulose, and their flavour tends toward sweetness or bitterness from sugars and organic acids. Mushrooms contain chitin in their cell walls (the same polymer in insect exoskeletons), which gives them a firmer texture and a savoury, umami-rich flavour. Umami, the fifth taste, comes from glutamates and nucleotides like guanosinate — compounds that also appear in aged cheese, tomatoes and soy sauce. A fresh shiitake or oyster mushroom delivers natural savouriness that vegetables simply cannot.
Cooking method changes too. Vegetables often benefit from quick heat to preserve colour and crunch. Mushrooms, particularly gourmet varieties, often improve with longer, slower cooking that deepens their flavour and softens their texture. When we work with local restaurants or teach cultivation workshops through the Community Mycology Lab at Remakery Brixton, chefs consistently tell me that mushrooms behave like neither vegetables nor meat — they occupy their own space on the plate. That uniqueness is why they command respect in professional kitchens and why learning to grow them well opens doors that vegetable gardening alone doesn’t.
Why does this classification matter when sourcing mushrooms?
Classification affects how food is regulated, labelled and sold. In the UK, mushrooms are classified as vegetables for retail and regulatory purposes — you’ll find them in the vegetable aisle, and they’re treated as vegetables for food safety law. But understanding that they’re actually fungi helps you ask smarter questions when you buy. A mushroom grown on sawdust in the dark behaves differently from one grown indoors under lights, and both differ from wild foraged species. Sourcing locally grown mushrooms from a grower who understands fungal biology means fresher produce, shorter supply chains and transparency about growing methods.
At the West Norwood Feast market and through our grow kits, we emphasise this transparency. When you buy from a local grower or join a foraging walk with the South London Mushroom Club, you can ask how mushrooms were cultivated, what substrate was used, and how long they’ve been harvested. That knowledge matters because freshness affects flavour more in mushrooms than in most vegetables — a gourmet oyster or lion’s mane begins to lose delicate flavour within days. Knowing what you’re buying, and why it differs from shipped-in commodity mushrooms, changes how you cook and eat.
What does this mean for growing mushrooms at home?
If you’re thinking about growing mushrooms yourself — whether through a grow kit or a workshop — the fungal classification tells you exactly why home cultivation works. Vegetables need light, soil (or hydroponic nutrients), and long growing seasons. Mushrooms need darkness or low light, an organic substrate (compost, straw, logs, spent grain), and weeks rather than months to fruit. A mushroom grow kit can colonise and fruit in a kitchen corner in 8–12 weeks, while a tomato plant takes months and demands a sunny windowsill. The biological difference makes fungi the practical choice for urban gardeners and people with limited space.
Our grow kits are designed to make this simple. You’re not gardening in the traditional sense; you’re tending a living system that breaks down organic matter and converts it into food. When people attend our cultivation workshops, they learn that success comes from understanding what fungi need — moisture, air exchange, and the right temperature — not from the vegetable-gardening habits they might already know. That shift in mindset is where the real learning happens, and it’s why education is central to what we do at Adi’s Urban Mushrooms.
How does this knowledge shape our approach to sourcing and growing?
Because fungi are their own kingdom, they don’t compete with vegetables for space, nutrients or expertise. In West Norwood, we grow gourmet mushrooms on substrates that would otherwise be waste — coffee grounds from local cafés, straw, sawdust from woodworkers. Growing mushrooms this way is regenerative; it diverts organic matter from landfill and transforms it into food. A vegetable farm can’t do that at the same scale or speed. Understanding fungi as distinct organisms helps us design growing systems that are genuinely local and genuinely sustainable.
This distinction also shapes how we work with the community. Through the South London Mushroom Club and foraging walks, we teach people to recognise wild fungi — something impossible if you’re thinking of mushrooms simply as vegetables. Foraging walks reveal the ecology: where fungi grow, what they grow on, why certain species appear in certain seasons. That knowledge deepens respect for mushrooms and makes home growing feel less like a hobby and more like participation in a living system. Whether you’re growing oyster mushrooms in a cupboard or foraging for hedgehog fungi in Peckham Rye, you’re working with biology that operates by its own rules — rules worth understanding.