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.
With the popcorn, I split one jar between two bags of straw and it worked well (but of course took some time to fill in). Since the rye berry jar has so much liquid on it, I might just dump the whole thing into a single bag when I'm ready to spawn the next one.
The next thing I need to figure out is spawning a colony from the existing mushrooms so I know how to keep the cycle going. And that'll require having some new grain jars prepped and ready to go. Maybe in a few weeks...