Grow Bags 101

Get your Grow On!

Our Promise

By following these instructions we guarantee at least one harvest, or we will send you a second block. As always, please reach out to us with any questions at any point during your process via Instagram - @btshrooms, or by email -

Included in your package

  • 5lb bag of oak sawdust that has been sterilized and inoculated with the species you selected.
  • Grow bag instructional document.

What you’ll need

  • 1 Sharp knife (ideally clean)
  • 1 Spray bottle of water (ideally distilled)


An ideal location will have the following:

  • 1-2 cubic feet of counter space
  • Temperature between 55-80F
  • Indirect light (at least 8hrs per day)
  • Humidity
  • Plenty of fresh air (do not place in sealed containers)


Open the shipping box right side up (ignore this if you picked up locally), and pull out the grow-bag without breaking apart the substrate inside. The substrate may already be loose from shipping. This is normal and will heal itself if you let it sit out for a day or two. 


  • Cut a 3 inch X on either side of the bag perpendicular to the species label (the side that was facing up when you opened the shipping box). Cut with enough pressure to also cut about a 1/2 inch into the substrate below the plastic. Do not cut an X any larger than 3 inches.
  • Mist the X 2-3 times per day ensuring both the plastic and the substrate underneath the plastic are becoming slightly hydrated. Distilled water is ideal, but is not required, as tap water will also work. If you are in a dry climate you will want mist more frequently, up to 5-6 times per day.
  • After a few days, but up to 2 weeks depending on the species, you will notice baby mushrooms starting to form. These babies are known as "pins." Once the pins form you will want to harvest within 4-6 days.
  • Once the mushrooms have reached 3-4" tall you will want to decrease misting to 1-2 times per day. At this stage it is critical the mushrooms get plenty of fresh air, but do not fan them as this creates the potential for drying out. The mushrooms will grow rapidly at this point. If you are growing Lion's Mane, and notice it starting to yellow, you should stop misting the mushroom directly altogether.


  • For Lions Mane, you will want to harvest before the mane of the mushroom starts to become too long. Refer to our species page for an ideal Lion's Mane look. Harvesting early will provide a much longer shelf life, while harvesting later will provide a very cool looking specimen that will need to be eaten immediately after harvest. If you grow the mane out too long, the quality of flavor will go down.
  • For Oysters, you will want to harvest before the caps begin to flatten out. Harvesting earlier will provide better flavor and longer shelf life. Harvesting later will provide much lower shelf life, but possibly a higher yield. Refer to our species page for an example picture of when to harvest. 
  • To harvest Oysters, run a knife along the base of the mushroom along the bag to cut it off. For Lions Mane, grab the mushroom gently and twist. Voila! You have a perfect mushroom ready to be cooked and added to your favorite dish. 
  • For 10% off your purchase, be sure to snap a picture and send it to us at We ask that you allow us to post this pic on our website in return.

Second Growth

To achieve a second harvest, simply assure all mycelium has been removed from where the previous mushroom was harvested. This means you are exposing the myceliated sawdust below the X, allowing new growth to occur. Start at the top of the instructions and work your way down for a second harvest. Some species can be harvested up to 3-4 times.

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1 comment
  • Love these! I’m hooked. So easy and delicious. I find the instructions to be confusing, a how to video would be great!

    Cheryl Jorgensen on

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