The Wave petunia comes in three sizes: Tidal, the largest flower; Shock, the smaller flower; and Easy, a spreading plant. Since its introduction in the 1990s the Wave petunia has become more and more popular. Garden experts seem to agree that the Wave petunias were developed primarily as a ground cover. The Wave petunia is propagated with seeds and tends to grow a huge root system. The root ball may become a problem in baskets and planters. They may also become overgrown in late summer and require pruning.
The Supertunia is the most recent development in petunias. Like the wave petunia, the Supertunia comes in many colors and sizes, as well as in single and double blossoms. The Supertunia is propagated with cuttings which help preserve its quality and vigor. Unlike the Wave petunia, the Supertunia variety adapts better to planting in pots because it drapes easily over the sides and grows very large without developing the massive root system of the Wave.