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Blue oyster mushrooms growing in a kit
(leminal.space)
Update: The first photo was day 3 of growing. We harvested on day 4, and got 255 grams of tasty snack! 
Be careful with these kits, especially if there's any extra moisture or humidity in your home. I've heard some horror stories about the mushrooms starting to spread.
Always a good idea to harvest just before they begin drop their spores!
Spread? Where to?
Humid areas like bathrooms. Especially true for mushrooms that decompose wood.
Oh I see - thanks for the warning!