Verbena stricta (Hoary vervain) Purple. Annual. Summer Bloom. Height 24 - 36". Sun. 525,000 seeds per pound Origin: North America. Zones: 3-9. Recommended Coverage 1 oz. Up to 250 Sq. Ft 4 oz. Up to 1,000 Sq. Ft 1 lb Up to 4,000 Sq. Ft 5 lbs. 20,000 Sq. Ft.