Organic Blue Oyster Mushroom Growing Kit Grow Indoors: All you need is water. Arrives ready to produce mushrooms and includes everything needed for home mushroom growing Photos on left: Main: Package you will receive. Next: Mushrooms 2 days after they start. Then: Mushrooms 3 days after they start. Bottom: Blue Oyster ready to harvest. First crop of mushrooms in as little as 7-10 days, but may take longer. Grow mushrooms indoors at room temperature on a coffee table, counter, or desk: humidity tent included. Quality DIY Indoor Mushroom Garden Kit