Verbena bonariensis blooms the first year from seed. The tall stems are topped with clusters of rosy-purple flowers that attract hummingbirds and butterflies. It's a host plant for the Common Buckeye butterfly.
Nearly every garden design book I've read mentions Verbena bonariensis. It's a terrific companion plant for roses, ornamental grasses, and tall perennials.
Verbena bonariensis is hardy in zones 7-10, but it often overwinters in my zone 5 garden. Grow it as a self-sowing annual in colder regions. It's very vigorous and may be considered invasive in warm zones. Also known as Purple Top Vervain. Deer resistant.
Sowing Verbena bonariensis Seeds:
Sow indoors in late winter. Sow on the surface, then refrigerate for 5 weeks. Full sun to part shade. Slow to germinate. Spacing 12".