Verbena bonariensis
Common Names: purple top
Family: Verbenaceae
Features:
Delicate, branching spires
Flower spikes that bear small, clustered purple flowers
Sunlight: Full sun
Ultimate Height: 1.5 - 2.5 meters
Ultimate Spread: 0.5 - 1 meter
Flowering: Summer - Autumn
Care:
Leave dead stalks to provide winter interest and mulch annually with well-rotted manure or compost.