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number of hours they’re subjected to cold, usually below 7C (44F). It may be one of the side effects of global warming – the areas in Europe that can produce apples will move northwards. So although late frosts can decimate crops if they damage the flowers in April, cold nights in January are essential to help produce the flower buds in the first place.

Apples rely on a cold winter to help them flower Artificial vernalisat (subjecting plants to temperatures) growers can be u to manipulate fl times and make plants much sooner than t would naturally