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Portabella mushrooms are the filet mignon of fungi. Now you can feast on the freshest, most flavorful portabellas ever by growing your own with this fun, foolproof kit. With a few minutes setup and daily misting, you can harvest fresh, hefty portabellas up to 5" across in just four weeks! The mushroom kit yields up to four pounds total. Please start growing within 2 weeks of arrival.