One aspect of beekeeping is planting as many plants the bees like as you can. Not all beekeepers do this but for those that do they're helping their bees out and potentially growing more food for the family. Though a single garden probably doesn't add much honey to the hive, no one can deny that if everyone did it the impact would be greater. Recently at a beekeeper's meeting I sat down with some beekeepers who garden and asked for some of their favorite sources on plants. These come highly recommended.
Bluestong Perennials
High Country Gardens
Wildseed Farms
Prairie Nursery
Happy Gardening