Many bedding plants produce little or no pollen and nectar, often as a result of selective breeding by horticulturalists for their pleasing appearance. Avoid planting showy double flowers - bumblebees can't feed on them. Plants like pansies and double begonias offer little for bumblebees and other pollinators.

Learn more:

https://bumblebeeconservation.org/images/uploads/Garden_centre_pack_FINAL.pdf