Verbena bonariensis, often called tall verbena, is a striking perennial known for its height and vibrant purple flowers. This plant features slender, upright stems with narrow leaves, and produces clusters of small, fragrant flowers from summer into autumn. Its tall, airy structure and long flowering period make it a great addition to gardens, borders, and natural-looking plantings, adding height and colour to various settings. It is part of the Verbenaceae family.
Origin: Verbena bonariensis comes from South America, specifically Brazil and Argentina.
Light: Verbena bonariensis grows best in full sun. It needs at least six hours of direct sunlight each day for optimal growth and flowering.
Water: Water regularly, particularly during dry periods and in the first year after planting. After it is established, it can tolerate drier conditions. Allow the soil to dry slightly between waterings to avoid root rot.
Soil: Verbena bonariensis prefers soil that drains well. It can grow in a range of soil types, but does best in fertile, loamy soil. Avoid heavy clay soils, which hold too much water.
Fertilising: This plant generally does not need heavy fertilisation. A light application of a balanced fertiliser in spring can help it grow well. Avoid over-fertilising, which can lead to excessive leaf growth and fewer flowers.
Pruning: Cut back the plant in late autumn or early spring to tidy it up and encourage new growth. Removing spent flowers can extend the blooming period.
Self-seeding: Verbena bonariensis spreads easily through self-seeding, so new plants may appear in the garden.
Pests and Diseases: Verbena bonariensis is generally resistant to pests and diseases, but watch out for aphids and powdery mildew.
Uses: Verbena bonariensis is mainly grown for its attractive flowers and tall, airy form. It's a popular choice for gardens, borders, and natural-looking plantings. It also attracts bees and butterflies.
Toxicity: Verbena bonariensis is generally considered safe for humans and pets.