'They don't grow in the dark': It's easier than you think to grow your own gourmet mushrooms

'They don't grow in the dark': It's easier than you think to grow your own gourmet mushrooms

Two food-obsessed sisters have turned a mission to create exciting meat-free meals into a thriving mushroom business.


It’s early autumn at the 300-year-old flint barn, overlooking the River Adur in West Sussex. This is HQ of the award-winning mushroom business Caley Brothers – run not by brothers, but by sisters Jodie Bryan and Lorraine Caley.

A table is loaded with out-of-this-world gourmet mushrooms – king oyster, yellow oyster, pink oyster, lion’s mane – all being cut and prepped for local restaurants’ seasonal menus. One of the king oyster mushrooms weighs in at a whopping 680g. “By growing them at home, you get monumental oysters,” says Lorraine.

What the sisters call their ‘mush love’ began in 2018, when they started considering plant-orientated diets. Their father was sadly ill with cancer, and with six young children between them, the sisters were trying to move away from meat-based meals .“We’re big foodies,” says Jodie. “There were exciting recipes using shiitake, oyster and lion’s mane, but we couldn’t buy them easily in supermarkets.” The portobello and button mushrooms they could find weren’t really hitting the spot. “We wanted to find an alternative that would hold the plate like meat tends to,” says Lorraine.

Two women holding mushrooms
Lorraine Caley with kits for shiitake and oyster mushrooms. The repertoire of fungi they sell is led by what they like to eat. ©Andrew Montgomery

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Inspired by an innovative social enterprise, GroCycle, which offers guides on how to cultivate mushrooms, the sisters decided to give growing their own a try. Jodie worked in hospitality and had contact with café owners. Before they knew it, they were collecting coffee grounds and buying spores (the microscopic reproductive cell of fungi, essentially the seed) to grow their first indoor harvest. “It felt like we were meant to do it,” says Jodie. “What people don’t realise is that mushrooms grow quickly. So when you start growing, you grow a lot.”

Mushrooms growing
Reishi or lingzhi mushrooms (Ganoderma sichuanense) have a shiny surface and dark colouring and can be dried and made into teas and tinctures. ©Andrew Montgomery

A local farm shop expressed an interest in selling them and the germ of a business began. “There is something curious about watching mushrooms growing,” says Lorraine. “Unlike a human or a plant that grows through cell division, mushrooms use the humidity in the environment to dilate and expand – doubling in size every 12 to 24 hours.”

Mushrooms
Spawn, the food source on which mushrooms grow, can be made from grain, as seen here, or other sources including seed, used coffee grounds or sawdust. Spawn feeds the mycelium network (seen here in white) that ultimately forms the mushrooms. ©Andrew Montgomery

In 2019, having both taken a career break to care for their children and their father, the sisters decided to transition from home growers to commercial business owners. As a homage to their father, they named their new company after his family’s 1950s green grocer business: CaleyBrothers. “Adopting the name felt like the right thing to do,” says Jodie.

Woman planting
Jodie mixes different substrates in a ratio of 70 per cent coffee grounds, 20 per cent straw and 10 per cent spawn. In their workshops, the sisters explain how to create this mix. “It’s hands on and gets people talking and learning,” says Jodie. ©Andrew Montgomery

The following year, as the Covid lockdown got underway, they quickly pivoted from fresh mushrooms to grow-at-home kits, enabling consumers to produce gourmet varieties simply and easily, and benefit from the inherent protein, fibre, B vitamins and minerals. “We created small batch kits inoculated with the chosen spore and started posting them out,” says Lorraine. “Clients sharing pictures of their resulting harvests on social media was key to our success.”

Mushrooms growing
Shiitake mushrooms (Lentinula edodes) are native to east Asia and a good source of protein. They have a strong and deep umami flavour with a rich, meaty texture. ©Andrew Montgomery

When the UK returned to its new normal, they engaged with farmers’ markets, starting with Chiswick thanks to a nudge from RHS photographer Helen Fickling. It was there that they met garden designer and TV presenter Arit Anderson, who, in 2021, asked them to install a display of mushrooms as part of her RHS Chelsea Flower Show Garden of Hope.

The sisters now exhibit regularly at RHS and BBC Gardeners’ World Live shows throughout the UK , as they believe passionately that face-to-face communication is the key to teaching people how to grow mushrooms, and spread the word about their nutritional and health advantages. It also gives them exposure to a network of people in the horticultural industry that often leads to other work. For instance, when publishers at the Royal Botanic Gardens, Kew, asked them to write a guide to growing fungi, they knew they had hit a new high for the business.

Dried mushrooms
Grow-at-home kits being prepared for sending out. These are handcrafted in small batches on the farm in West Sussex, and include everything needed to grow indoor gourmet mushrooms. ©Andrew Montgomery

Today, Caley Brothers is a thriving enterprise that supplies fresh mushrooms to farmers’ markets and wholesalers as well as grow-at-home kits, and offers workshops and events that aim to educate, along with one-off consultancy projects.

The sisters think of themselves primarily as food producers. “We approach the business like gardeners,” says Jodie. “Lorraine and I grew up helping on the family allotment and holidaying on farms so we understand food growing.”

They are convinced that regardless of space or time, anyone can grow their own. “From opening the kit to harvesting can take as little as two weeks,” says Lorraine. One of the greatest advantages of growing indoors is that it allows you to harvest delicious, safe and insect-free mushrooms full of flavour.

Old jeans
The sisters are always looking for alternative spawns and substrates, and have tried sawdust, straw, grain, paper and even this pair of old jeans. ©Andrew Montgomery

The sisters call it ‘kitchen foraging’ and enthusiastically describe their recipe repertoire; replacing chicken with a lion’s mane and beef mince with a finely chopped oyster mushroom. “There are many different flavours,” says Lorraine. “Pink and yellow oysters are slightly sweeter. Grey takes marinades easily. Shiitake is intense in flavour – meaty in texture and strong.”

Mushrooms growing
Shiitake can be trickier to grow than some mushrooms, but the Caley Brothers’ no-frills Grow Kit makes success easier if left somewhere light and airy, such as a kitchen counter. “There’s a myth that mushrooms need to be grown in the dark,” says Jodie. “But that stems from button mushrooms that have been cultivated in the dark. Gourmet mushrooms need light to grow.” ©Andrew Montgomery

With strong beliefs in a low-tech footprint and the need for a circular economy, the sisters have looked to alternative substrates including sawdust (now sourced from an East Sussex joiner), straw, grain, paper and, perhaps most unusually, old pairs of jeans. The barn from which they operate is neither heated nor cooled, and they grow only species that thrive in the UK’s seasonal climatic conditions, adding Asian favourites, such as maitake (hen of the woods), enoki and nameko in the winter.

Mushrooms growing
Pink oyster (Pleurotus djamor) resembles delicate rose petals but has a bold umami flavour. These mushrooms are best grown in the warmer months. ©Andrew Montgomery

More fresh varieties are on the agenda for the future as well as education programmes with community projects, schools and colleges. “We bring different energies to the enterprise, but we balance really well,” says Jodie.

Mushrooms
Lion’s mane (Hericium erinaceus), also known as tooth fungus, looks fabulous and makes a good vegetarian alternative to chicken. Jodie cooks it with a dry spice rub in a hot, dry pan for caramelisation. ©Andrew Montgomery

Lorraine, whose background is in retail design, leads on branding, marketing, social media and graphic design, while Jodie’s superpower is her affinity for growing and product standards. Lorraine sums it up: “There’s a mutual respect for each other’s skills, but it wasn’t our backgrounds that led us here, it was our passion for mushrooms.”

How to grow your own gourmet mushrooms

Mushrooms growing
The Caley Brothers’ Grey Oyster Mushrooms Grow Kit offers a guaranteed first flush, so you can enjoy at least 200g of fresh grey oyster mushrooms over two flushes – and maybe even more if you follow the simple instructions for additional harvests. ©Andrew Montgomery

By growing indoors, you can cultivate a crop of mushrooms to harvest at any time of year. Follow these simple steps:

  • A steady temperature and the right amount of light are enough for mushrooms to thrive over the course of a few months. Always follow the instructions for each variety on your mushroom-growing kit.
  • Make sure your hands, work surfaces and equipment are clean. Mould is potentially the biggest threat to your mushroom- growing projects, so wash and sterilise work surfaces and equipment before you begin.
  • Fresh spawn is key to successful growing. Spawn is the simple pre-culture that is inoculated with the fungi. It comes in many forms, but Caley Brothers focuses on grain and sawdust spawn for indoor growing. Keep it in the fridge until you are ready to use it.
  • The most common reason mushrooms fail to grow is dehydration. Don’t forget to spritz, according to the instructions. If your substrate feels dry, it probably is. Regularly inspecting your kit is key to gauging moisture levels, making sure your mycelium is establishing itself nicely. A good sign is when you see the mycelium beginning to coat the substrate: a clean, white waxy layer will grow over and through the material, binding it together. Your substrate should always be damp to the touch and smell fresh.
  • Maintaining a good circulation of fresh air is vital. Mushrooms absorb oxygen and expire carbon dioxide, even during the incubation stage. During the growing process, oxygen levels can alter the form of your mushrooms. If the air is stagnant a build up of carbon dioxide can cause the caps of oyster mushrooms to be smaller and the stems longer. Too much air can also make a difference; when lion’s mane mushrooms grow in a draught, they change colour, turning brown and drying out.
  • As a general rule, you should harvest all the fruiting bodies at once. It is not often that you are able to pick some of the larger mushrooms and allow the rest to continue growing. After harvesting, leave the substrate to rest for a while (see instructions on kit). This will allow the mycelium to recover and prepare for a second harvest.

Useful information

Find out more about Caley Brothers’ mushroom kits, events and collaborations at caleybrothers.co.uk

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