YUM! Grow Mushrooms In Coffee Grounds

Do you know that it is super easy and fun to grow yummy mushrooms at home, in used coffee grounds and cardboard, indoors and outdoors in all seasons! Today I am excited to share with you our fun journey, with more tips and resources at the end!
This simple method requires no complicated sterilization. Below is a video of how fast they grew in just 4 days!
Why coffee grounds and cardboard? Because they are a match made in mushroom heaven! Coffee grounds are rich in nutrients, but can contaminate easily. Corrugated cardboard - most are untreated in the USA- is not as rich and delicious to competing molds and bacteria, and the corrugation allows room for air and for the mycelium (mushroom roots) to run.
To start, ask for a bag of hot-off-the-press coffee grounds from the lovely people at Starbucks, and soak some cardboard in water 1-2 days prior. The coffee grounds should be used on the same day!
Take a one-gallon plastic container, cut 3 sides of the lid. Poke and cut 4 to 6 small 1/4 size holes to allow air exchange and drainage on the bottom. Wipe the inside and outside of the container with rubbing alcohol.
You also need some quality mushroom spawn( seeds, kind of, which can be found easily online) to start the first batch of mushrooms. You can keep the life cycle going and learn to grow your own mushroom spawn using this same method with mushroom stem bases from your harvest in future.
Layer the materials like how you would make a lasagna, keep the humidity level high, and watch the magic happen!
Mushroom roots started growing in just a few days! Keep the container in the dark for now!
After 2-3 weeks, you will see Dr. Seuss mini forest popping out! Move it into bright shade, and you will have yummy mushrooms in just 3-4 days! We already got several harvests =)
Save the stem base to start your own mushroom spawn!
Ready to jump in? Come check out loads of helpful tips, more details and resources at the link below!

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Want more details about this and other DIY projects? Check out my blog post!


Have a question about this project?

3 of 7 questions
  • Isabelle Martell Sampson
    on Aug 8, 2017

    do you break up the wet cardboard or leave it flat?
  • LaurieAnn Lepoff
    on Sep 9, 2017

    can shitakes be grown this way?
    • Marlene
      on Dec 10, 2019

      Shitake is best grown in recently cut oak that has been drilled with 5/8" diameter holes. Soak the 4" branches that are cut to 2-3 ft lengths in water--can use a big foodsafe plastic bag. Fill the holes with purchased spawn (any extra purchased can be kept in the refrigerator). Keep moist and dark and it will grow. It feeds on the oak.

  • Mary
    on Aug 17, 2019

    where do you get your mushrooms to start this project.

    • Judi McClelland
      on Sep 24, 2019

      You need to read the first section of instructions carefully, she said you can buy the spores on-line.

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