Verbena rigida, known as slender vervain or tuberous vervain, is a flowering herbaceous perennial plant in the family Verbenaceae. It is native to Brazil and Argentina. In temperate climates, it is grown from seed as an annual.
Verbena rigida, or slender vervain, is a low-growing perennial species that produces an abundance of punchy purple flowers from summer and into autumn. Its lax growing habit makes Verbena rigida fantastic for planting in great swathes and softening the edges of borders. It will also self-seed, and makes a great addition to sunny gravel gardens and wildlife gardens. Growing to 60 centimetres (24 in), it has a spreading habit, with stalkless toothed leaves and clusters of bright purple or magenta, scented flowers, held on branched stalks, in summer. Numerous cultivars have been selected for garden use.
