How Coffee Grounds Grow Mushrooms and Fund Community Projects

Every day, millions of people toss out coffee grounds without a second thought—but what if those grounds could grow food and fund livelihoods? In Shanghai, university students discovered a way to turn this common waste into a resource for both urban farming and social good.

Yes, used coffee grounds can grow multiple edible mushroom varieties including shiitake, oyster, king oyster, and monkey head mushrooms. With proper setup, low-income households using free cultivation kits earned an average of 520 RMB per month, and over 15 tons of coffee waste were diverted from landfills.

Coffee Grounds as a Fungal Growth Medium

Shanghai University of Finance and Economics’ entrepreneurship center found that coffee grounds contain cellulose, a key nutrient for mushroom mycelium, and caffeine, which aids plant growth. The grounds also absorb heavy metals and neutralize odors. These properties make them far more than trash—they’re a functional substrate for fungi.

The students consulted with professional mushroom growers and co-developed ready-to-grow mushroom kits. The kits only require consistent temperatures and light misting—about four to five sprays daily under stable conditions—to produce edible mushrooms.

From Cafés to Communities

To gather raw material, the team partnered with over 30 Shanghai cafés, collecting spent coffee grounds two to three times weekly. They stored the grounds in sterile bags to maintain hygiene and named the initiative “Coffee Green Plants.”

A poetic name for a practical solution: the collected grounds became the base for mushroom cultivation kits distributed at no cost to 80+ low-income families across four Yangpu District communities. Participants were trained in cultivation techniques. On average, each household added 520 RMB to their monthly income through mushroom sales. If scaled to rural areas, the project could benefit 100 urban dwellers receiving minimum welfare and 40 rural farmers.

More Than Mushrooms: Expanding the Model

The success of “Coffee Green Plants” catalyzed other student-led social ventures under the university’s “project leader” system. One team tackled orange oversupply on Chongming Island by identifying urban demand for orange juice, ice cream, and crisps, then connecting farmers to processors and markets. Another, “Warmhearted Mutual Benefit,” preserved traditional crafts like crochet and palm weaving by training student volunteers to teach these skills in schools and libraries.

Each semester, seven or eight such initiatives launch, with winter and summer breaks serving as key implementation windows. Failure and rejection are routine—students often faced initial resistance when giving away free kits, had to secure buy-in from processors before helping farmers, and even learned traditional crafts themselves to pass them on—but these obstacles forged resilience and real-world business skills.

Frequently Asked Questions

What types of mushrooms can you grow with coffee grounds?

You can cultivate shiitake, oyster , king oyster , and monkey head mushrooms using coffee grounds as the growing medium. These varieties have been successfully grown in kits developed by Shanghai students.

How much money can low-income families earn from these mushroom kits?

Low-income families in Shanghai’s Yangpu District earned an average of 520 RMB (approximately $70 USD) per month by cultivating and selling mushrooms from the free kits provided by the project.

How many coffee grounds are needed for mushroom cultivation?

While the article doesn’t specify the exact quantity per kit, the project as a whole collected 15 tons of coffee grounds and helped divert this waste while producing edible mushrooms for hundreds of people.

How often do you need to water the mushroom kits?

The mushroom cultivation kits require misting four to five times a day with water, and should be kept in a space with relatively stable temperatures to encourage growth.

What other social projects did the students launch?

Beyond mushrooms, students created programs to sell surplus oranges as juice and snacks, and taught traditional crafts like crochet and palm weaving in schools to preserve cultural heritage and engage youth.

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