I had a bit of grain left during my last run, so I mixed the bits I had left.
This is interesting, actually. Over the next few months, I'll continue this experiment to see what grain mixes might work better for spawn.
While this wasn't a "proper" test, I had still hypothesized that the higher starch content in the popcorn would do better. I guess not.
I'll try and separate testing into different categories like starch content, moisture content, mycelium strain, etc. There is probably a ton more conditions to isolate as well.
Mixed genetics cubensis. (It's of PE/JMF lineage; I don't want to get distracted in those details since it's not quite appropriate for this community.)
I wrote up more details in another comment, but yep, you just pre-boil the popcorn before sterilization. It's not cost effective in low quantities, btw.
I would rate this thread a B+
I use rye berries and oat mainly, deer corn would probably be cheaper though...