BONARIENSIS
Tall, erect, branching stems with terminal clusters of mauve flowers from mid to late summer. Gives height to other plantings. Self-seeds.

BONARIENSIS 'LOLLIPOP'
A dwarf V. bonariensis which will appeal to quite a few of you I should think, with a more bushy habit. Mauve flowers from July to October. Not sure totally hardy. (PBR)

HASTATA ROSEA
Attractive, candelabra spikes of pink flowers, for months from midsummer. Should self-seed.

HASTATA 'WHITE SPIRES'
Attractive, candelabra spikes of white flowers, for months from midsummer. Should self-seed.

RIGIDA
Rather like a dwarf version of Verbena bonariensis and will self-seed especially if grown in a gravel garden. Needs a more sheltered position.

RIGIDA F. LILACINA 'POLARIS'
Upright stems, of clusters of pale silvery blue, with a hint of lilac flowers for months from June. It needs a well-drained sunny spot in a sheltered situation to overwinter, otherwise treat as an annual and take cuttings.