Quote:  Grant what do you mean by "tripped"? 
 
Let me quote from the Peace Bee FARM:

The alfalfa plant may be harvested up to five times per year for high-protein hay. Between cuttings of the hay, the alfalfa may bloom and attract honey bees.

Alfalfa is a perennial plant in the important family of bee plants, the legumes. From alfalfa, the bees collect both nectar and pollen. There is one problem that the honey bees encounter in working alfalfa flowers, though. The structure of the alfalfa blossom hides the nectar and pollen from the foraging bee until the flower is physically tripped by a bee. To access the alfalfa pollen and nectar, the bee must press its head against the flower petal until the flower’s male and female parts are exposed. In this process, the flower slaps the bee directly in the face. Understandably, many nectar-gathering honey bees dislike the tripping mechanism of alfalfa. They soon learn to insert their tongues between the petals to remove nectar without tripping the flower. These bees, as a result, don’t pollinate the alfalfa. Pollen-gathering honeybees are effective pollinators, however; because they must trip the flower’s mechanism.
 
peacebeefarm.blogspot.com/2009/09/​alfalfa-in-bloom.html 

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