Lots of flowers provide abundant nectar and pollen for bees. All Bees get all of their carbohydrates from floral nectar, and all of their protein from floral pollen.
Bees rely on flowers to supply them with the food they need to survive. Some flowers (e.g. tomatoes) provide only pollen, the main source of protein for bees. Other flowers (e.g. clovers) provide both nectar and pollen, thus providing both protein and