Growing Mushrooms from Stems in Coffee Grounds: 7 Tips

Growing mushrooms from stems in coffee grounds is a great way to start your mushroom-growing journey, as it is a simple process. In this article, we will discuss seven tips that you should follow if you want to successfully grow mushrooms from stems in coffee grounds.

Choose the right type of mushroom that is compatible with the coffee ground. Use fresh coffee grounds and sterilize them by boiling or baking them. Collect mushroom stems and cut off the caps. Inoculate the coffee grounds and mix everything. Keep the mixture moist by misting it. Harvest the mushrooms after a few weeks.

To learn about these techniques and hacks in detail, keep reading. With these tips, you will be able to get your mushroom garden growing in no time.


  • Keep the mixture in a warm and humid environment to encourage mushroom growth and monitor the growth regularly to ensure the best results.
  • Use fresh, healthy mushroom stems to ensure the best chances of success when growing mushrooms from a stem in coffee grounds
  • It's important to be gentle when harvesting the mushrooms to avoid damaging the remaining coffee grounds and to store the mushrooms properly to ensure their freshness.

Seven Techniques to Grow Mushrooms in Coffee Grounds

Growing mushrooms from a stem in coffee grounds is an experiment, but it's an easy and sustainable way to cultivate your delicious fungi at home. You might not get the same yield every time. However, with these tips, you'll have a great chance of growing your own delicious and sustainable mushrooms at home. Here are seven tips to get you started:

1. Choose the right type of mushroom to grow

Some mushrooms, like oyster mushrooms and shiitake mushrooms, are better suited for growing in coffee grounds than others. Oyster mushrooms and shiitake mushrooms are better suited for growing in coffee grounds than other types of mushrooms for a few reasons:

  • Coffee grounds are rich in nutrients like nitrogen, phosphorus, and potassium, which are essential for mushroom growth. Oyster mushrooms and shiitake mushrooms are particularly well-suited to these nutrient levels and can thrive in coffee grounds.

  • Coffee grounds are acidic, which makes them an ideal growing medium for mushrooms that prefer a slightly acidic pH level. Oyster mushrooms and shiitake mushrooms both prefer a pH level between 6 and 7, which is similar to the pH level of coffee grounds.

  • Oyster mushrooms and shiitake mushrooms are some of the most commonly cultivated mushroom varieties, making them easier to find and grow at home.

Make sure to choose a type of mushroom that is compatible with coffee grounds. Note that different varieties of mushrooms may have different growing requirements and may not all be suitable for growing in coffee grounds.

It's always a good idea to research the specific requirements for the type of mushroom you want to grow to ensure the best chances of success.

2. Use fresh coffee grounds to prevent harmful bacteria

Make sure the coffee grounds you use are fresh, as old grounds can harbor mold and bacteria that can harm your mushroom crop. Coffee grounds are an organic material that can decompose over time and provide a breeding ground for harmful microorganisms.

To avoid using old coffee grounds, it's best to use grounds that have been brewed within the last 24 hours. If you're using coffee grounds that have been sitting for longer, make sure to inspect them closely for any signs of mold or spoilage before using them for your mushroom-growing project.

If in doubt, it's always better to err on the side of caution and use fresh coffee grounds to ensure the best possible growing conditions for your mushrooms.

3. Sterilize the coffee grounds by boiling or baking

Sterilize the coffee grounds by boiling them for at least 5 minutes or baking them in the oven at 200 degrees Fahrenheit for 30 minutes. This will kill any bacteria or fungi that may be present. This process will also help break down the coffee grounds and make them more suitable for mushroom growth.

4. Collect mushroom stems to grow

Collect mushroom stems from fresh mushrooms that are of the same variety as the ones you want to grow. To collect mushroom stems from fresh mushrooms, follow these steps:

  • Use a damp cloth or paper towel to wipe the surface of the mushrooms clean. Avoid rinsing them underwater, as this can make them waterlogged and harder to work with.

  • Gently twist the stem of each mushroom to separate it from the cap. The stem should come away easily, but be careful not to damage the cap or the stem itself.

  • Once you've removed all the stems, use a sharp knife to trim away any remaining bits of the cap or gills from the bottom of the stem. You want to make sure that you're left with a clean stem that's free of any debris or bits of mushroom flesh.

  • Collect the mushroom stems in a clean container or plastic bag. You can store them in the refrigerator for up to a week, or use them immediately for growing mushrooms in coffee grounds or other growing mediums.

By following these steps, you'll be able to collect mushroom stems from fresh mushrooms that are ready to be used for growing new mushrooms at home.

It's important to use fresh, healthy mushroom stems to ensure the best chances of success when growing mushrooms from a stem in coffee grounds.

5. Inoculate the coffee grounds with mushroom stems

Once the coffee grounds have cooled, add the mushroom stems and mix everything thoroughly. You can do this in a clean container or plastic bag. Make sure the stems are evenly distributed throughout the coffee grounds.

  • Once the mushroom stems are mixed with the coffee grounds, place the mixture in a warm, dark place to incubate. The ideal temperature for mushroom growth is between 65 and 75 degrees Fahrenheit.

  • You can use a plastic bag or container with a lid to create a humid environment for the mushrooms to grow.

  • Check on the mixture regularly to see if the mushrooms are starting to grow. You should see small white dots (mycelium) appearing on the surface of the coffee grounds within a few days to a week.

6. Keep the mixture moist in the mushroom environment

Mushrooms need moisture to grow, so keep the coffee grounds moist by misting them with water daily. Cover the mixture with a damp cloth to retain moisture. Here are other things to keep moist:

  • If you're using a container to incubate the mushroom mixture, make sure that it has a lid or cover to prevent moisture from escaping.

  • You can use a spray bottle filled with clean water to mist the mushroom mixture regularly. This will help to keep the coffee grounds moist and provide the necessary humidity for the mushrooms to grow.

  • You can also add a small amount of water to the bottom of the container to create a reservoir of moisture.

  • Check the mushroom mixture regularly to make sure that it's staying moist but not too wet.

7. Harvest the mushrooms and enjoy your fresh harvest

After a few weeks, you should start to see mushrooms growing. Harvest them when they are mature and fully grown. Cut them off at the base of the stem, leaving the rest of the coffee grounds in the container to continue growing new mushrooms.

  • The mushrooms will typically take between 1–3 weeks to mature, depending on the type of mushroom and growing conditions. The caps should be fully formed, and the stems should be firm.

  • To harvest the mushrooms, gently twist and pull them off the coffee grounds. It's important to do this carefully to avoid damaging the remaining coffee grounds or any other mushrooms that are still growing.

  • You can harvest the mushrooms in stages, picking the larger ones first and leaving the smaller ones to continue growing. This will allow you to maximize your yield and extend the lifespan of the mushroom bed.

  • Store the harvested mushrooms in a paper bag or other container in the refrigerator. Fresh mushrooms will last for several days to a week.

  • After you've harvested the mushrooms, you can prepare the coffee grounds for another round of mushroom growth by sterilizing them again and adding fresh mushroom stems.

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