Categories Perennials | red & pink flowers | Verbena bonariensis cv. Purpletop Vervain Description Popular name(s): Purpletop Vervain, Clustertop Vervain, Argentinian Vervain and others Botanical name: Verbena bonariensis cv. Family: Verbenaceae Origin: The wild type is native to South America (Argentina, Bolivia, Brazil, Paraguay, Uruguay) Height: 50 to 130 centimetres USDA zone: 8 (-12 °C) Related plants:Duranta erecta Glandularia × hybrida Lantana camara Monk’s Pepper Verbena officinalis