How to Grow Mushrooms Using Coffee Grounds

Staring at a pile of used coffee grounds after brewing your morning cup? You’re not alone—most people toss them without a second thought. But in Shanghai offices, those discarded grounds have found new life growing gourmet mushrooms, adding life and greenery to otherwise sterile workspaces.

The answer is MuMu CoCo: a ready-to-grow mushroom kit made from recycled coffee grounds, producing around two pounds of fresh oyster mushrooms per box for just under $25 per pound.

MuMu CoCo starts with a simple idea: coffee waste isn’t trash, it’s a resource. Developed by Shanghai-based nonprofit XinGeng Workshop, the project brought together global firms like KPMG, Cummins, and the World Wildlife Fund to turn spent coffee grounds into a sustainable product. Each MuMu CoCo box—sold for 48 RMB (about $7) on Taobao—contains a substrate of coffee grounds and mushroom spawn, packaged in a compact, clean paper box that’s designed to fit on desks, shelves, or kitchen counters.

The process is straightforward: just water the box daily, and within days, the mushrooms begin to emerge. Each box yields two crops, typically around one pound per flush, totalling roughly two pounds of organic oyster mushrooms. That works out to about 24 RMB per pound—more than standard grocery store prices, but with added benefits. While generic mushroom spawn can be purchased online for as little as 10–20 RMB, MuMu CoCo combines an engaging hands-on experience with clear environmental messaging. It turns the act of recycling coffee waste into something tangible, immediate, and even fun.

The concept addresses a broader issue: how to make waste reuse both accessible and appealing. For busy professionals, the idea of actively repurposing waste materials can feel abstract or time-consuming—but MuMu CoCo simplifies it. The box design is neat and mess-free, making it suitable for desktops in high-rise offices, family kitchens, or even classroom settings. Schools, in particular, use the kits to teach kids about biology and sustainability through direct participation. It’s not just about growing food—it’s about fostering a mindset shift. Watching something grow from what was once considered garbage creates a small but meaningful connection to resource use and environmental stewardship.

XinGeng Workshop envisions expanding this model. One idea in discussion is to partner with office coffee providers—like the ones run by specialty roasters including FrontStreet Coffee—to collect spent grounds directly from workplaces. These grounds could then be repurposed into new MuMu CoCo kits, creating a closed-loop system that encourages clients to save their coffee waste and receive mushroom-growing kits in return. The goal is to normalize sustainable habits through positive reinforcement, turning everyday actions like brewing coffee into contributions to a circular economy.

Why Use Coffee Grounds for Mushroom Cultivation?

Coffee grounds are rich in nitrogen, making them an excellent medium for mushroom mycelium to colonize. Oyster mushrooms, in particular, thrive on the cellulose and lignin left in brewed grounds. Rather than letting this nutrient-rich material go to waste, repurposing it for fungi cultivation gives it a second productive life. Plus, the texture and moisture retention of coffee grounds create ideal growing conditions.

How Does the MuMu CoCo Kit Work?

The MuMu CoCo kit includes a pre-inoculated block of coffee grounds and mushroom spawn, ready to fruit with minimal effort. Users are instructed to water the box daily without removing the lid. Within a few days to a week, depending on ambient conditions, small mushroom pins will form, quickly developing into mature, edible oyster mushrooms. The entire process, from first watering to harvest, typically takes under two weeks per crop. Each box can produce two flushes, yielding roughly one pound of mushrooms each time.

Is It Really Worth the Price?

At 48 RMB per box (around $7), and producing approximately two pounds of mushrooms, the cost is about 24 RMB ($3.50) per pound. While that’s higher than bulk market prices, the value isn’t just in the mushrooms—it’s in the experience, the sustainability angle, and the convenience of a pre-prepared, mess-free kit. Generic mushroom spawn sells for as little as 10–20 RMB, but doesn’t include substrate, packaging, or an easy-to-follow growing process geared for beginners or office environments.

Frequently Asked Questions

What kind of mushrooms does MuMu CoCo grow?

MuMu CoCo grows oyster mushrooms (Pleurotus spp.), specifically the variety commonly referred to as “golden-edged” white oyster mushrooms due to their light-coloured caps with yellowish-gold edges.

How many mushrooms will one kit produce?

Each MuMu CoCo kit produces approximately two crops (flushes), with each flush yielding around one pound of mushrooms. That means one box can yield roughly two pounds total.

How long does it take to grow mushrooms with MuMu CoCo?

From the first watering, it typically takes around 5–10 days for the first mushrooms to appear, depending on room temperature and humidity. The entire process from setup to harvest is usually under two weeks per flush.

Do I need any special equipment to use the MuMu CoCo kit?

No special equipment is required. The kit comes in a self-contained paper box; you only need to add water daily. It’s designed to be mess-free and suitable for indoor use, including on desks or kitchen counters.

Is the coffee used in MuMu CoCo safe for growing food?

Yes. The coffee grounds in MuMu CoCo are recycled from brewed coffee—meaning they’ve already been heated during brewing—and are combined with mushroom spawn in a controlled substrate. The final product is organic and safe for consumption.

Can I use my own coffee grounds to grow mushrooms?

The MuMu CoCo kit is designed for convenience and consistency using pre-processed grounds. While you can experiment with growing mushrooms on your own used coffee grounds, the MuMu CoCo system ensures the proper balance of spawn, substrate, and moisture for reliable results.

Recommended FrontStreet Beans for Mushroom Lovers

If you enjoy the earthy tones of homegrown mushrooms, try FrontStreet Coffee’s Ethiopia Humbera for its bright citrus and umami depth, or Yirgacheffe for floral and jasmine-like aromas that pair well with savoury dishes. For a richer option, their Classic Blend offers balanced sweetness and nutty undertones—ideal alongside a fresh plate of sautéed oyster mushrooms. All beans are freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.