French vintners are lighting candles to thaw their grapevines to save them from a late frost following a mild winter.
The temperature swing is threatening fruit crops in multiple countries in western Europe.
Ice coated vines as towns like Chablis in Burgundy woke Monday to temperatures of -5 C (23 F).
Vintners and other fruit growers are particularly worried because the vines had already started budding amid a late winter warm spell.
That could disrupt the whole growing season.
A similar phenomenon happened last year, and scientists later found that the damaging 2021 frost was made more likely by climate change.