I don't keep bees, but do feed lots of them.
Have a perennial garden, with a large variety of plants in it. Don't use pesticides or herbicides. Result: healthy and balanced insect populations and ongoing butterfly visits.
Also notice very large numbers of especially honey bees, but also lots of bumblebees, throughout the summer and into the fall. The most obviously popular plants with the bees are culver's root (species and cultivars), purple loosestrife cultivars (don't use the species) and globethisle (species). The bees must do a lot of pollinating (not invariably useful: e.g. cross-pollinating lungbane cultivars). Spend the summer working among bees which I find very relaxing.
Saw the first bee of the year today, a small honey bee working snowdrops and species crocus.
Know of a few specifics: notably, monkshood and bumble bees. Though I have numbers of summer and fall flowering monkshoods, I seldom see bees around them. On the other hand, the globethistle is hugely popular with the bumblebees. I am getting the impression that bees particularly favor plants with tall spike-like flowers (bee attracting adaptations?), e.g. the culver's roots and purple loosestrife.
Can anybody add anything to the matter of what types of insect/bee pollinated plants are particularly favored, by bees (honeybees), in mixed perennial flower gardens or in flower gardens in general?
Somewhere I have a list of plants that bees particularly love. I will look for it and share with you, but I don't think I have with it the zones they grow in. But you could probably decide that for yourself.
Thanks for that list. I have been wondering what to plant around the veggies to attract bees and birds for pollination. Some of those will work for me. Fortunately, I also like blues and lavendars! ;~)