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How to grow mushrooms on coffee grounds?

There are many options for growing vegetables and fruits indoors Microdosing shrooms. From hydroponics to the old way of growing fresh greens in pots on the windowsill.

And those who want to experiment and expand their horizons can easily and cheaply grow oyster mushrooms.

One of the methods of cultivation involves taking freshly used coffee grounds and a little straw as a substrate and mixing it with the mycelium of mushrooms.

With six million tonnes of coffee grounds dumped each year, it is also an environmentally friendly way to repurpose what would otherwise be wasted.

Mycelium is a vegetative part of fungi, similar to the root or stem of an ordinary plant. Parts of the mycelium are vegetative reproduction of fungi.

What do you need for growing?

Straw (pre-cut into pieces of 2.5 cm)

Oyster mushroom mycelium (available online or from a local mushroom grower) * Store in the refrigerator until use *

  • Fresh coffee grounds
  • Isopropyl alcohol (70%)
  • Pan
  • Garbage bags or bags for storing food
  • Rope or rubber band
  • Kitchen scales
  • Thermometer
  • Sieve
  • Gloves
  • Bottle with spray
  • Stationery knife
  1. Wipe all materials with alcohol.

It is important to disinfect everything throughout the process to prevent the spread of unwanted bacteria.

  1. Pasteurize the straw before mixing the mycelium, coffee and straw. Do this by immersing it in boiled water at 170 degrees for 1 hour 15 minutes. Determine the exact water temperature with a thermometer.
  2. Transfer the straw to a sieve to drain off excess water.
  3. Take fresh, freshly used coffee grounds and mix it with the straw in the pan. Remove any lumps of coffee separately with your hands in disinfected gloves.

It is important to use coffee that has just been brewed. This ensures that no mold has accumulated in it.

  1. Add the oyster mushroom mycelium and stir.
  2. Pour this mixture into a clear plastic bag. You may want to use more than one package, depending on the amount of material.

Reminder: This bag should be wiped with alcohol.

  1. Squeeze the resulting mass tightly using a rope or rubber band. Make sure there is no air in the middle of the soil.
  2. Flip the bag upside down and with a stationery knife make two or three small holes with a diameter of no more than 2.5 cm. Also make two small holes in the front and two small holes in the back.
  3. Place the bags in a dark, humid place (ideally 18-23 ° C) and keep them there for about two to three weeks, periodically checking for mycelium. You can find out about the growth of mushrooms when most of the bag will be occupied by hairy white matter. The growth of the mycelium means that small fungi will appear very soon.
  4. Once the mycelium has absorbed the coffee and straw mixture and you begin to see small mushroom “heads” forming (after two to three weeks), make the holes a little bigger – a maximum of 5 cm.
  5. Move the bags to a brighter area with indirect sunlight, such as on the windowsill. At this stage, you can start in the morning and evening to spray the bags with water spray. When the tops of the hats begin to flatten, it’s time to harvest. This usually happens within 10 days.