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The filet mignon of fungi! Giant portabellas can reach up to 8" across and are perfect for grilling. Growing your own mushrooms is a fun and rewarding family activity. With this easy-to-use kit, you can expect to harvest your first batch of giant portabellas in about four weeks. You'll get several crops over an 8- to 12-week period, with a total harvest of about four pounds. Please start growing within 2 weeks of arrival.