Uploaded August 2025 | Updated September 2026, 3 weeks ago

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Can compost piles and haystacks really catch fire on their own? Yes — and microorganisms are a big part of the story. In this video, I explain the science behind spontaneous combustion in organic material, from backyard compost to large hay bales.

You’ll learn:
How bacteria and fungi in compost generate heat
Why damp hay can lead to dangerous hay fires
The role of metabolic heat and chemical oxidation
How high core temperatures can trigger a runaway reaction
Why farmers monitor hay temperature to prevent fire

Spontaneous combustion in compost heaps and hay isn’t magic — it’s a mix of biology and chemistry. Whether you’re a gardener, farmer, or just curious, this is a fascinating look at how microbes can influence fire safety.

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