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Growing Mushrooms from Coffee Grounds

ritau
07月27日
1. Obtain coffee grounds. Growing mushrooms from coffee grounds is a fun project which helps to use up coffee grounds that would otherwise go to waste. Coffee grounds are a fantastic growing medium for mushrooms (oyster mushrooms in particular) as they are already sterilized thanks to the coffee brewing process and are full of nutrients.
For 500 g (17.6 oz) of mushroom spawn, you will need 2.5 kg (88 oz) of fresh coffee grounds. The best way to get this amount of fresh coffee grounds (brewed that day) is to go to a cafe and ask nicely. They're usually more than happy to give it away.

2. Find a container for the mushrooms. The best thing to use is a filter patch grow bag, which can usually be purchased along with the mushroom spawn. Otherwise you can use a large, sealable freezer bag or a sterilized milk carton or ice cream tub, with four small holes poked into the sides.



3. Transfer the spawn into the container. Wash your hands thoroughly with anti-bacterial soap, then mix the mushroom spawn into the coffee grounds, breaking them up with your hands to ensure that they are evenly distributed. Place the inoculated coffee grinds into the plastic bag or container and seal tightly.

4. Put the mushrooms in the right environment. Place the bag or container in a warm, dark location, somewhere between 64 and 77°F (18 to 25°C), like in an airing cupboard or under the sink. Leave it here for two to four weeks or until it turns entirely white — this due to the mycelia colonizing the coffee grinds.
-Again, cut out any dark spots of green or brown that develop on the colonizing substrate, as this can make you sick.

5. Relocate the mushrooms. Once the bag or container's contents have turned completely white, move it to a bright area (but not into direct sunlight) and cut a 2" by 2" hole at the top. Mist the contents of the container with water twice daily to prevent it from drying out — the mushrooms won't grow in too-dry conditions.

6. Harvest the mushrooms. Over the next five to seven days, tiny mushrooms will begin to sprout. Continue to mist them with water and they should double in size each day. When the cups of the mushrooms have started to turn slightly upwards, they are ready to harvest.
When the mushrooms have stopped sprouting, plant the coffee grinds outdoors under bark mulch or compost and new mushrooms may develop, depending on the weather.

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