Start from spores or liquid culture, this special recipe will provide your precious mushroom with all the nutrients it needs to develop into beautiful fresh mushrooms inside the bag or spawned to some other medium such as pasteurized straw and sawdust. Made with precision and care with only the freshest and most organic ingredients. Please note! This mushroom growing rye grain bag is a more advanced substrate product and requires more experience to have success. If you are new to this process we suggest you try using Rye Grain Jars before attempting to use the bags. Mushroom Growing Rye Bag Instructional Video