Clusters of pale violet flowers are produced continuously on veined verbena (Verbena rigida 'Old Royal Fragrance'), a nonhardy South American perennial that has naturalized in the southern states. It has pairs of stiff, deeply-toothed leaves and square stems. In a growing season in the Chicago area, gardeners can expect this plant to reach 1 foot in height by 2 feet in width. It attracts butterflies and honeybees, but the stiff hairs on the stems and the bad-tasting compounds in the leaves deter deer from browsing its blooms. The species is hardy to zone 7 and will not survive winters in Chicago.