Following is one of the floral host plant recommended for apiary

Rose is one of the floral host plants recommended for apiary.
Bees drink nectar, however they also need pollen which is their source of protein, and contains nutrients essential for Bees to stay healthy.
As roses produce a lot of pollen and Bees visit the roses especially to collect the pollen. The buzzing of bumble bees can be quite loud as they typically grab hold of the anthers and vibrate their thorax against them to release the pollen.