daylight hours for overwintering
By Upstairs
United States 
May I leave grow lights on 24 hours a day when overwintering tender perennials indoors?
On plant
tender perennials
18 Nov, 2011
Answers
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
I wouldn't. Plants do notice and some will not flower unless they have the requisite number of hours of darkness.
18 Nov, 2011