Ready To Grow MUSHROOM KIT $14.00 - $19.95 Talk about a box lunch! This DIY kit yields tasty results. Grow up to 1.5 lbs of pearl oyster mushrooms with just a spray of mist twice a day. Each kit can grow 2-4 crops. Harvest your first crop of delicious mushrooms in as little as 10 days. Made in Oakland, CA. Item ID: 21055 Materials: 100% Recycled Coffee Grounds, oyster mushroom spawn 4.5" L x 3.5" W x 11" H; 3 lbs.