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daylight hours for overwintering

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May I leave grow lights on 24 hours a day when overwintering tender perennials indoors?

On plant tender perennials



I wouldn't. Plants do notice and some will not flower unless they have the requisite number of hours of darkness.

18 Nov, 2011


Why? Plants need to acclimatise to the local environment and require darkness.

18 Nov, 2011


Better to have them on 10-12 hours a day to match their natural seasonal rhythms. Length of time doesn't really compensate for lack of intensity.

19 Nov, 2011

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