In response to the amount of caffeine in used coffee grounds.
41 mg of caffeine per 17 gm of used coffee grounds.
I have observed my bees rolling in coffee grounds for years. As with prior years; once our pollen flow started on February 28th. they stopped.
http://pubs.acs.org/doi/abs/10.1021/jf3040594
Sticky Bear Apiary
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