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Verbena Flower Seeds: Description: Verbena are natives of North and South America. Verbenas or Vervain can grow from 6 inches to 4 feet high and may be bushy or creeping in growth. The toothed or cut leaves usually grow opposite each other and reach a length of 1 to 3 inches. In the summer or fall, slender stalks arise and bear flattened clusters of flowers, 2 to 3 inches across. They may be multi-colored, red, rose, peach, pink, purple, lavender, or blue, usually with a white eye. V. Bonariensis (Purple Top) is a pretty species forming basal rosettes of serrated, wrinkly, dark green leaves. In the summer and autumn, thin stems topped with clusters of tiny, bright purplish-pink flowers grow. This species can reach a height of up to 5 feet.