How antifrost candles protect vines from May frost?
Wine growers use a variety of ingenious techniques to guard vulnerable vines from sudden temperature drops.
May is a critical month for wine growers. Vines are resistant to low temperatures in winter, but once the new leaf tissue has broken out – a process known as bud burst – the new growth is vulnerable to the slightest frost. The traditional protection is to light thousands of antifrost candles. A cold spell last year meant that there were against frost candles burning in late May in parts of Switzerland.
The vineyards antifrost candles work by a combination of heating and smoke. The smoke forms a blanket which helps to block heat loss by radiative cooling, effectively a miniature version of the greenhouse effect.
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