Lawley's Garden
Verbina bonariensis
Species: Verbina bonariensis.
Tightly packed clusters of lilac-purple flowers on tall, stiff, branching stems from June to September.
Perfect for a sheltered, sunny, well-drained spot, its open, transparent shape means that it can easily be used at the front or middle of the border despite its height.
Self seeds
Flowering period: June to September
Hardiness: borderline hardy (will need protection in winter in colder areas)
Beware hot to weed up new growth!