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.