What it is
When the temperature drops below 0 °C, the water inside the leaves freezes, ice crystals burst the cells and the tissue dies. Leaves end up dark, soft and then dry, as if cooked.
Who it hits hardest
Small plants, which can die from a single frost. A big plant survives a light frost, but loses leaves and gets stressed. In flowering, hard cold stops ripening.
How to protect against it
Don't have plants outside in winter or sow before the last spring frosts have passed. If one is forecast, cover the plants at night with frost cloth, water the day before (damp soil holds more heat) and, if possible, bring the pots inside.
🎮 Practice it in UnderGrow
Below 1 °C outside, the cold burns plants: small ones (or ones not yet sprouted) lose a lot of health and can die; big ones less. In batches, plants are lost. The panel warns "frost" in tomorrow's forecast.
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