Two begonia cultivars, "Cocktail Brandy" (shown here) and "Ambassador Rose Blush," and the impatiens cultivar "Accent Coral" drew in the most pollinating insects among all those tested.

Tuberous begonias are big and beautiful container-type plants with large, candy-colored double blooms, while the semperflorens – wax begonia – types are the workhorses of shady garden beds.