Wave: The original spreading petunia grows low & wide with a height of 4-6 inches and a 3-4 foot spread Shock Wave:  this is a well branched, mounded plant with a height of 7-10 inches and flower heads around 1.5 to 2-inch flowers, spreading 2-3 feet wide. The Shockwave has smaller flowers than the rest of the waves. Easy Wave: Grows more …