Sweet clover: "Sweet clover is a fine source of nectar and pollen for honey bees. Usually both yellow and white are used by beekeepers because yellow may bloom as much as two weeks before white, and a combination of the two extends the flowering season."- White, Ladino and Sweet Clover, Jimmy C. Henning and Howell N. Wheaton, Department of Agronomy
Alfalfa: "Alfalfa is a perennial plant in the important family of bee plants, the legumes. From alfalfa, the bees collect both nectar and pollen." - Alfalfa in Bloom, Richard Underhill
Buckwheat: "I have two small plots currently in buckwheat. They total about .6 of an acre. They were planted June 8th.....so as of today they are almost exactly 6weeks old.
The crop is bountiful, as you would expect with all the moisture & heat we've been getting. Coincendentally my neighbor has allowed a beekeeper to put about 12boxes 50yds off of my property line. (a blessing, I know).
Well, you simply cannot believe the buzz coming off of the plots at about 10am these mornings. You can hear bees from nearly 40yds away. And when you step up to the side of each plot the air above the plants is alive with bees flitting from one blossom to another." - ...Buckwheat & Honey Bees.... fairfax1