Inoculate the log with the spawn. Do this between one and three weeks after cutting the log, or once you obtain a prepared log from a catalog or online resource. To inoculate, drill shallow holes in the log, pack them with spawn and seal the holes with wax. You can also order logs that are pre-inoculated.
Leave the log in shade to allow the spawn to colonize it. If you have several logs, stack them. This process can take from several months to close to a year, depending on the type of mushrooms you are growing.
Induce fruiting. To do this, soak the log in fresh, cold water for 12 to 18 hours. Then replace it in the shade to retain moist conditions.
Check for fruiting daily. When mushrooms are ready to harvest, cut them off with a small knife. Inoculated logs can produce several crops of mushrooms.