3x Verbena bonariensis 20/40cm (9cm)

Argentine Verbena – Verbena bonariensis brings an airy, cottage garden charm to borders and containers with its tall, slender stems topped with clusters of vibrant purple flowers. This graceful perennial creates a see-through effect in planting schemes, allowing you to layer it throughout beds without obscuring other plants behind. The delicate flower heads appear from midsummer through to the first frosts, providing months of colour whilst attracting an abundance of butterflies, bees and other beneficial pollinators to your garden.

Growing to impressive heights despite its delicate appearance, this South American native has naturalised beautifully in gardens across the British Isles. The square stems rise up with minimal foliage, creating vertical interest without bulk, making it perfect for weaving through herbaceous borders or softening the edges of gravel gardens. Each branching stem carries tight clusters of tiny tubular flowers in rich violet-purple shades that seem to float above neighbouring plants.

Verbena bonariensis thrives in full sun positions and well-drained soil, proving remarkably drought-tolerant once established. It performs particularly well in gravel gardens, prairie-style plantings and Mediterranean-inspired schemes. The plant self-seeds generously, though never invasively, creating drifts of purple throughout your borders year after year. Seedlings are easy to transplant or remove if they appear where unwanted.

Care Guide for British Climate

Plant in a sunny, sheltered spot with good drainage. Heavy clay soils benefit from incorporating horticultural grit or sharp sand to improve drainage, as waterlogged conditions during winter can prove fatal. Space plants 30-45cm apart to allow for their spreading habit whilst maintaining good air circulation.

Water regularly during the first growing season to establish a strong root system. Once settled, plants become remarkably resilient and require watering only during prolonged dry spells. Feed with a balanced fertiliser in spring to encourage vigorous growth and abundant flowering.

Deadheading spent blooms encourages continuous flowering, though leaving some seed heads intact provides autumn and winter interest whilst offering valuable food for finches and other seed-eating birds. The dried stems also create attractive skeletal forms when touched with frost.

In colder regions, apply a generous mulch of organic matter around the base in late autumn to protect the crown from severe frosts. The plant often behaves as a short-lived perennial, but its prolific self-seeding ensures continuity. Cut back old growth to ground level in early spring before new shoots emerge.

Verbena bonariensis rarely suffers from pests or diseases, though powdery mildew may appear in dry conditions with poor air circulation. Ensure adequate spacing and water at the base rather than overhead to minimise this risk.

The plant combines beautifully with ornamental grasses, Echinacea, Rudbeckia, Salvia and Gaura, creating naturalistic prairie-style combinations. Its vertical form contrasts wonderfully with mound-forming perennials and provides late-season nectar when many other plants have finished flowering.

Ultimate height
1–1.5 metres

Time to ultimate height
2–5 years

Ultimate spread
0.5–1 metres