Manual Growing lights
on and start to close 10 to 12 hours later.
Switching on the growing lights before midnight, causes the flowers to close as early as 10:00 in the
morning [...] it takes up to 60-90 minutes for the last foraging bumblebee to return to the
hive. Under low light conditions, this time increases up to 120 minutes. [...] Watt/m2 sunlight outside.
To help them do their job, our general advice is to place the hives as high as possible (above the crop) in
the greenhouse. Several