The ultimate petunias for landscaping. If the Tidal Waves are spaced 12 inches apart, they form a hedge of flowers 16 to 22 inches tall. Spaced 24 inches apart they'll spread like a groundcover 8 inches tall and 4 feet wide. With support such as a trellis or bush, Tidal Wave plants grow almost like a vine. They resist lodging, recover quickly from rain showers and won't fall open in the center. They have excellent Botrytis tolerance. Once you've tried them you won't plant any other petunia.