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Rice (flour) is a common substrate to grow mushrooms. Make sterilized/hydrated rice cake and inject some spores into it.

I have four bioluminescent petunia houseplants above my bed for that.

I was curious, and here is a video of the product (not trying to push marketing).

Those are the ones. They’re awesome. I put one in a clear pot and the roots glow. https://www.instagram.com/ceejayoz/p/C8_Dgqvuq2C/