Fungi love grains, all seeds & cereals. Rye (Secale cereale) has for many years been the industry standard when it comes to mushroom spawn preparation. It is highly nutritious and has a high protein content. Once one has the preparation technique or recipe mastered there is no beating it for biological efficiency. We've done the legwork and found you the best source for organic food grade rye.
Recipe Tek for perfect hydration of rye berries is achieved by soaking in cold water for 24 hours, bringing to a slow boil for an hour & then strain for 3 hours until almost dry to touch. To stop grains clumping (plus a little extra calcium) add a handful of gypsum & calcium carbonate.