Weed details for blue vervain Full name blue vervain (Verbena hastata) Characteristics Flowers: Purple/pink/ble with 5 petals Leaves: Pointed leaves with finely serrated edges; some hair Habitat: Found in moist areas; especially in southern plain states Life cycle: Perennial Other common names:  swamp verbena; blue verbena; Simpler's-joy

Taxonomic data retrieved May 21, 2008, from the Integrated Taxonomic Information System on-line database, http://www.itis.gov.