Living · 6 pages · 12 min
A cover slows heat leaving for the sky, and it fails if it touches the leaves or the night is too cold.
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A cover on a freeze night works by slowing the loss of heat that the ground and the plant are radiating away. It is a lid over a small store of warmth, not a heater, unless you add a real source of heat under it. The opening covers the cover traps ground heat, why the cloth must not touch, and a hard freeze empties the store.
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