Clover and alfalfa are most used by commercial endeavors, but any great quantity of any 1 particular plant will affect the taste and make it more of a "specialty" honey. You would also like to make sure that you have variety to bloom for all season long.
Keep in mind that when bees go out to collect pollen, they usually travel out in a radius of several miles, so, while a bee garden can be pretty to look at, chances are only a handful of your own bees will use them (unless you have a large amount of open land).
I was lucky to attract a big Swarm to tree branches in my urban garden - by having large masses of purple/blue flowers in bloom - beginning in early Spring: Lunaria (money Plant ) was earlier, and masses of Borage Bloom all summer. Both reseed profusely - and have other benefits.
A beekeeper referred by the City of Portland came to collect the Swarm and provided their permanent home. A neighbor and I hope to be able to share some of the Honey.
BeeKeepers near Portland - email me if you want next years Swarm.
I also send lots of seed by SASE. Or if you are near Portland Oregon, come by for a Garden visit, and bring a box fora variety of goodies. (It's not a very purty place, but prolific...)
A note - I allow a massive old rosemary to grow on the south side of my house, near a window so I can watch what happens all year. It flowers all winter, providing a happy place for the larger Hummingbird - and Mason Bees.
I also provide a water source (not deep, and refreshed often) fairly low to the ground for bees, and I try to collect and use rainwater for that and for all plants. They seem to like to share a mock Bog Garden (a concrete bird bath on a low stump) with some Carniverous plants from Sarracenia Nursery in Oregon. I've seen flies get eaten - but not Bees)