Hay bales ferment up until they’re **dry**. There’s a ton of bacteria that wants to eat that hay, and they get hot as they digest it. The thing is, hay has a lot of surface area; there is a ton of **air** and space in those bundles for that bacteria to sit on. So there can be quite a lot of **super hot** bacteria going into a feeding frenzy…
TLDR: Those bales can actually burst into flame if they get too hot, and that will happen if too many of them are stored too close together. It’d be incredibly dangerous to store them together until fermentation slows.
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