growveg – “Tried growing mushrooms before, and it didn’t work”

“Tried growing mushrooms before, and it didn’t work” – if I had money for every time someone has said that to me I’d be a very rich man…and probably no longer a mushroom farmer! Mushrooms are notoriously unreliable to grow, partly due to the mass-produced low quality kits that people often try. Almost mystical organisms, they seem to pop up in the wild in an unpredictable way, often only appearing for just 5 or 6 days before vanishing back into the ground again, not to be seen in the same spot for another year or three. Yet, despite a poor reputation amongst home growers, by using a particularly simple technique and getting a bit of insight into how mushrooms grow, it is possible to successfully grow your own gourmet mushrooms at home. So how exactly are mushrooms cultivated? How can you have success at home? And more to that point – what’s all this got to do with waste coffee grounds?

How Mushrooms Grow

How to grow your own mushrooms

Firstly, you must understand the life cycle of a fungus. Similar to the fruits produced by a tree, mushrooms are the reproductive fruits of a dense, root-like network of cells, called ‘mycelium’. In the wild, this white network of fine threads grows out it all directions, breaking down its food into simpler molecules to further fuel its growth. When it runs out of food, or is put under some other form of environmental stress, it switches into survival mode and produces mushrooms in order to release its spores to the wind and find a better place to live. Fortunately for us humans, it’s possible to recreate and manage this life cycle, and by doing so you can nurture many a fine crop of mushrooms for the table!

Now, it must be said that growing your own mushrooms is definitely more difficult than growing nearly any other crop if you use the standard methods. Mushroom farming normally relies on significant pasteurisation equipment and climatic control. This can be hard to recreate at home without spending a fortune.

Growing Oyster Mushrooms

Growing oyster mushrooms

The best advice for success is to start by growing Oyster mushrooms, the easiest and most forgiving variety for any home cultivator to grow. Next you must consider the growing medium. The most common materials to grow Oysters on are usually freshly cut hardwood logs or shredded straw. Growing mushrooms on logs can be quite hit or miss and will take up to a year for your first harvest. Growing on straw requires you to pasteurise the straw first, to kill off resident micro-organisms that will compete with your mycelium.

This is where coffee comes in. The beauty of growing mushrooms on fresh coffee waste is that the substrate is already pasteurised by the coffee brewing process, so you can bypass the whole pasteurising step and get straight into the inoculating. Plus, spent coffee grounds are a huge waste resource, and are packed full of nutrients which your Oyster Mushrooms love to grow on.


Tips for growing mushrooms

Firstly order your spawn in. You’ll have greater success if you use a high spawn: coffee grounds ratio. To begin with, I’d recommend using around 500g of oyster mushroom spawn to each 2.5kg of spent grounds. If the vendor you purchase the spawn from also sells filter patch grow bags, get one of these too. They will increase your chance of success by reducing contamination and providing the perfect growing environment inside the bag. If you can’t source one of these, you can try using a large 2 litre freezer bag, empty ice-cream tub or milk carton – cleaned out well, and with 4 x 5mm holes cut in the sides.

Coffee collection

Go to a busy café and ask them nicely if they can give you some spent grounds. You’ll need enough to fill the bag or container you’re using two-thirds full, and the grounds need to be fresh that day. Most cafes will be happy to do this – if you encounter any problems, just ask at another one. Large cafes get through kilos of the stuff every day, and most are happy to see it going to good use. Take it home and (within 24 hours whilst it’s still fresh) weigh out 2.5kg of coffee into a clean mixing bowl.

Wash your hands and lower arms well and mix your spawn into the bowl, breaking it up and distributing it evenly throughout the coffee. Now load the mixture into your cultivation bag or container and close it up tight, ensuring you have cut the 4 air holes if you are not using the filter patch bags.

Spawn run

watching your mushrooms grow

Place your bag/container in a warm (64 – 77°F, 18C – 25°C) and dark place (airing cupboard, under a bed, in a cupboard in a heated room etc). During the next three weeks, you will see the spawn come to life and grow across the coffee grounds – turning the whole mixture white by the time it has fully colonised the mixture. It’s a fun time to keep checking up on it and watch it grow from day to day.


After 3 weeks, your whole bag/container of the coffee and spawn mixture should now look completely white. If you see any areas of green, this is a competitor mould. If it is just a small patch, you can try adding a little salt to the area which should kill it off and still allow the mushroom mycelium to prosper. If the whole bag has gone green, then I’m afraid it’s a lost cause and will most likely be caused by poor quality spawn, or by a lot of mould spores having been mixed in with the coffee grounds somewhere along the way. However, if you have used a high rate of spawn, fresh spent grounds and followed clean hygiene, the chances are you will be looking at a nice white bag of mycelium ready to fruit you some home grown mushrooms.

Place it in a spot with plenty of fresh air and a little light – a shaded windowsill or worktop is ideal. Cut a 5cm x 5cm (2in x 2in) hole in your bag/container and spray this area twice daily with water, trying not to allow it to dry out. Mushrooms love damp, humid conditions, and they will outright refuse to grow if it’s too dry.

watching your mushrooms grow

After a week or so, you will start to see tiny little mushrooms bursting into life. Over the following 5-7 days they will double in size every day. This is a really fascinating time! Each day you wake up to find them larger; looking more and more meaty and ready for the eating. When the edge of the caps begin to turn upwards, it’s time to harvest and enjoy the fruits of your labour. Cut at the base of the stems and get cooking!

We’re grateful to Adam Sayner of Fungi Futures for sharing his fantastic method of growing mushrooms on coffee waste with our readers. If you’d like to save yourself the trouble of collecting coffee waste and inoculating the mixture, Adam sells ready-made kits on his website ( We’ve used them ourselves and can definitely recommend them – unlike most mushroom growing kits they really work! If you are based in the US you might wish to check out Fungi Perfecti ( for spawn.


I chili di caffè venduti da un bar sono veramente indicatori dell’incasso?


I chili di caffè venduti da un bar sono veramente indicatori dell’incasso? Spesso sì, vediamo come.

Non sono poche le volte in cui, alla ricerca di un locale in vendita troviamo, frugando su internet annunci come questi:

…bar tabacchi con consumo di 6 kg di caffe” al giorno…

…il bar ha un consumo di caffè di circa 2,5 kg giornaliero…

Ma questo dato, dei chili di caffè venduti, e veramente così importante da poter decidere dell’acquisto o meno di un locale?

La maggior parte dei bar italiani basa di fatto i suoi introiti sul caffè e sulle brioches della mattina; il classico bar dell’angolo, come migliaia di bar Italiani, ha un pranzo abbastanza ristretto e un aperitivo altrettanto accennato, e la maggior parte dell’incasso li fa la mattina, con caffè e colazioni.

Sono abbastanza pochi i locali che, al contrario, riescono a maturare cifre interessanti in altri segmenti della giornata, ed è per questo che il dato sul consumo di caffè è considerato molto interessante da un esperto compratore.

Ma perché questo dato viene dato con facilità, mentre al contrario viene tenuto molto più riservato il fatturato del locale, di cui dovrebbe essere indicativo?

Primo, perché questo dato, chiarificante per gli addetti ai lavori, è invece oscuro per chi non ha idea di come funziona il mondo del bar, dando questo dato, si spera di attrarre compratori “del mestiere” considerati più sicuri e solvibili.

Secondo, perché se l’incasso può avere parti meno ufficiali (mi permettete il parlare in maniera un po’ oscura?) i chili di caffè permettono di dare un’idea abbastanza corretta del giro d’affari del locale pur senza citare cifre “da verificare”

Non si può concludere questo post, su un argomento delicato, senza dare un po’ di cifre che possano guidare i nostri lettori.

Un bar che consuma 1.2 /1.5 di caffè al giorno ha spesso un’incasso di 300/350€ al giorno, mentre un consumo di 2,5 chili porta a superare i 500€. Naturalmente è un dato tutto da verificare, ma, come uscito da un lungo dibattito durante uno dei nostri ultimi corsi di gestione bar (vero Andrea?) può essere molto indicativo…

better – backtotheroots.

From Bankers to Mushroom Farmers


Back to the Roots was founded by Alejandro Velez & Nikhil Arora during their last semester at UC Berkeley in 2009. Two months away from graduation, and heading into the corporate world of investment banking & consulting, they came across the idea during a class lecture of being able to potentially grow gourmet mushrooms entirely on recycled coffee grounds. Inspired by the idea of turning waste into wages & fresh, local food, they experimented in Alex’s fraternity kitchen, ultimately growing one test bucket of tasty oyster mushrooms on recycled coffee grounds. With that one bucket, some initial interest from Whole Foods & Chez Panisse and a $5,000 grant from the UC Berkeley Chancellor for social innovation, they decided to forget the corporate route, and instead, become full-time urban mushroom farmers!
Inspired by the idea of producing local, fresh food, we realized our company’s true passion wasn’t in bulk mushroom farming, but rather in creating tools to make food personal again and bring beautiful design, sustainability, education, and food into homes and classrooms around the world! Our first product was a Grow-at-Home Mushroom Kit that lets anyone grow their own delicious oyster mushrooms right out of a little brown box! Our second product, The Aquaponics Garden is a small, self-cleaning fish tank from which you can grow your own food!
We’ve since stopped bulk mushroom farming and are focusing our efforts on developing inspirational products to connect families to food and building a movement around them to make food personal again!