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.

Prefer bright shade, out of direct sun. Tuberous begonias have a dormant winter period, while semperflorens or wax begonias can flower all year round and are often used as bedding plants outdoors.