Shiitake Mushroom Log $29.95. Will produce a crop of organic shiitake mushrooms every two months for more than three years. Enjoy cooking with your first harvest within a month. Just soak the log for 24 hours in cold water, mist it occasionally if your environment is dry, and watch your crop emerge. Logs will fruit from 1 week to 30 days after first soaking. Can be kept in the house or outdoors in a shady spot. 3 "–5" diam., approx. 10" long; 3–5 lb.