Buy healthy, green plants with no signs of wilting or disease. Plants should be stocky, with plenty of leaves. It's actually a plus if they don't have any flowers on them - they'll divert their early energy into root development rather than flowering. Choose a site in full sun, though in warmer climates verbena appreciates some afternoon shade as well. The soil should be fairly fertile but also very well drained.
Verbena thrives in rock gardens and between cracks of pavers or bricks.
Plant in spring in USDA zones 2 to 8. Water only occasionally. Verbena likes its soil on the dry side. Trim or shear faded flowers to promote longer blooming. Tear out and discard plants in fall, after frost fells them.