I would think you would get more than one crop.Here's my latest crop, was walking through Target a while back and saw these kits on the discount shelf. Still cost 10 bucks, not sure if there is 10 bucks worth of mushrooms there, but it was kind of neat to watch them grow, took about 8 days to get to this point, harvested them last night and put some on a pizza. They are oyster mushrooms. Might try it again, I see there are all kinds of kits on line...
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There are other ways to get your mushroom growing fix on. The spores can be bought on other strata - innoculated wood plugs being one popular option. Might look up what growing media is best of good for oysters.