2019 AAS Winner. Mega Bloom is an exciting new series of vinca bred to withstand heat and humidity without succumbing to disease. Polka Dot excels in that area plus sports huge showy flowers on full, vigorous plants that stay tidy and compact. The leaves of Mega Bloom Polka Dot stay a healthy green all season resulting in large healthy plants all summer until frost. Each large bloom (3-4”) has attractive overlapping petals in snowy white with a bright pink eye. Photo courtesy of All America Selections (AAS).