Fennel is worked by crowds of western Yellow Jackets (Vespula pennsylvanica) in the fall (and famously supports the larvae of Swallowtail butterflies).
Except in the most extreme dearth, the honey bees mostly ignore it in my yards, sometimes briefly stopping on the flower crowns before moving on. One can observe both abundant pollen and nectar, so I am not sure why it unfavored by the bees.
I concur with JWC. The bees just don't like it the same way the vespids do. I have it my garden in the hope that Swallowtail butterflies will regard it as a nursery for their young...that's not happened yet, though it's established itself as a weed. They also don't like dill.
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