Tidal Waves are the largest and most vigorous of the Wave petunia family. Tidal Wave Petunias can attain heights of 2 to 3 feet if spaced closely together, about 6 inches, and given support such as a trellis. If plants are spaced a foot apart, the mounded, hedge-like plants will reach 16 to 22 inches. Neither pinching nor pruning is needed for flowers all season.
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