If you’ve mastered half-pint jars, making grain spawn is the next logical step. When a jar of grain is completely colonized it can be used to inoculate other jars of grain using what’s called a grain to grain transfer. Paul Stamet’s explains that 1 jar of colonized grain can inoculate 10 more jars of grain. Each of these jars in turn can inoculate 10 more jars and finally those can inoculate 10 bags of bulk substrate each. If you are using the quart jars for grain to grain transfers you can leave out the injection site. » Read more: Growing Mushrooms on Grains

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