You can use almost any grain as long as it's in it's whole form.
You can use almost any grain as long it's in its whole form. Rolled grains are not suitable.
The most widely used grain in preparing of spawn is rye (= rye berries), but also wheat, millet ( with hull, NOT hulled millet), millet based birdseed ( finch seed), sorghum, popcorn, whole oats...
You should use organicaly grown grain if available, but animal feed quality grain will also work OK.
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