Trevor is correct about stimulating the queen..  We provide  supplemental 
pollen and nectar, both to offset shortfalls of food resources, but  also to 
stimulate foraging - we place the food stuffs at various points in the  
greenhouse to get the foragers out and working.
 
One has to monitor bee activity, too much food and they'll skip the  
flowers.  You can place the food out in different places on different days  to 
keep them searching.  Or do a day on, day off.
 
Jerry
 

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