Mushrooms are not vegetables; they’re fungi, a separate kingdom entirely. This distinction matters when you’re sourcing fresh produce, planning meals, or growing your own. Understanding what mushrooms actually are helps you choose the right varieties for your cooking, storage and sourcing decisions—and it changes how you think about cultivating them.
What makes a mushroom different from a vegetable?
Botanically, mushrooms belong to the kingdom Fungi, not Plantae. Unlike vegetables—which are edible parts of plants such as roots, leaves, stems or seeds—mushrooms are the fruiting bodies of fungal organisms. They lack chlorophyll, they don’t photosynthesise, and they absorb nutrients from organic matter rather than producing their own through sunlight. This isn’t a culinary technicality; it’s a fundamental difference in how they grow, what they need to thrive, and how they behave in your kitchen.
In the UK, the Food Standards Agency and retailers often group mushrooms with vegetables for practical purposes—you’ll find them in the fresh produce aisle, and they’re counted toward daily vegetable servings in nutrition guidance. But the underlying biology is distinct. When I grow gourmet mushrooms at the studio in West Norwood, the growing methods are nothing like cultivating lettuce or carrots. Fungi need different substrates, humidity levels, light conditions and temperatures. Understanding this distinction helps you appreciate why fresh mushrooms are grown the way they are, and why dried or preserved mushrooms behave so differently from fresh.
How does the fungal classification affect growing and sourcing?
Because mushrooms are fungi, not plants, they can be cultivated in spaces where vegetables cannot. They don’t need soil, they thrive in shade, and they can be grown year-round indoors on substrates like straw, sawdust or agricultural waste. This is why small-batch gourmet producers across South London—including the Community Mycology Lab in Brixton and growers supplying the West Norwood Feast market—can produce fresh mushrooms consistently without outdoor space or seasonal breaks. A commercial kitchen, a converted basement or a dedicated growing unit can all become productive mushroom farms.
For sourcing, this matters too. When you’re buying fresh mushrooms from a local grower, you’re not buying something that took months in a field; you’re buying something grown in a controlled environment, often harvested within days of sale. The substrate, moisture and temperature can be precisely managed, which is why locally grown gourmet varieties—oyster, shiitake, lion’s mane—often taste more vibrant and last longer in your fridge than supermarket imports. The fungal nature of mushrooms means transparency about growing conditions is both possible and valuable.
What does this mean for storage, preparation and cooking?
Because mushrooms are fungi, not plants, they behave differently in storage and cooking. They don’t wilt in the way leafy vegetables do; instead, they dry out or absorb moisture and begin to darken. Fresh gourmet mushrooms should be stored in paper, not plastic, in a cool place—the fungal cell structure is sensitive to excess humidity. When you cook them, they release water quickly and can go from firm to rubbery in minutes if you’re not attentive. This is why knife skills and heat control matter more with mushrooms than with many vegetables.
Dried mushrooms—which I produce in small batches at the studio—preserve the fungal tissue differently than dried vegetables would. Mushrooms concentrate in flavour when dried because the cell walls are fundamentally different; they rehydrate unevenly, which means the best results come from understanding the specific mushroom variety and how long to soak it. A dried shiitake needs 20 minutes in warm water; a dried oyster might need just 10. This variability, tied to the fungal biology, is why knowing your source and having guidance on preparation transforms dried mushrooms from an afterthought into a cornerstone of your cooking.
Why do nutrition labels and recipes still call mushrooms vegetables?
In the UK, food retailers, nutritionists and government dietary guidelines treat mushrooms as vegetables for practical purposes. The Eatwell Guide includes mushrooms in the vegetable and beans category because they’re nutrient-dense, low in calories, and culinary vegetables in the kitchen. This is a useful classification for meal planning and nutrition communication, even though it’s not botanically precise. The distinction between botanical fact and practical use isn’t a contradiction; it’s a reflection of how language adapts to context.
For your purposes as a cook or grower, both framings are useful. Know that mushrooms are fungi so you understand why they grow differently, cook differently and store differently from plants. But use the vegetable classification when you’re planning balanced meals or understanding food labels. The South London Mushroom Club and other local growing communities talk about mushrooms in both ways—as fungi to understand how to cultivate them, and as vegetables to understand how to use them in the kitchen.
How can you source or grow mushrooms with confidence?
Understanding that mushrooms are fungi—not vegetables—gives you a clearer framework for sourcing. Ask your grower or supplier about the substrate, growing conditions and harvest date. Because mushrooms can be grown indoors year-round on renewable materials, you can expect consistency and transparency that’s harder to achieve with field vegetables. Look for producers who can describe their methods clearly and whose mushrooms arrive fresh, not pre-packaged for weeks.
If you’re interested in growing your own, the fungal nature of mushrooms means you don’t need a garden. We produce mushroom grow kits at the studio designed for indoor growing—on a windowsill, in a cupboard, or in a dedicated space. We also run cultivation workshops where you learn why the conditions matter, how to read the fungal growth, and how to harvest at peak flavour. Whether you’re a home cook curious about DIY production or a chef wanting to understand your supply chain, knowing mushrooms as fungi opens up clearer conversations with growers and more intentional choices in your kitchen.