Tall see-through stems carry clusters of mauve-purple flowers that butterflies adore, perfect for weaving through a border. Self-seeds freely and is a weed risk in some regions.
At a glance
- Plant type: Perennial
- Mature size: 1.5 m H × 50 cm W
- Aspect: full sun
- Water: happy on low water
- Frost: hardy
- Maintenance: low maintenance
- Origin: Exotic
About Purpletop Vervain
Botanically, Verbena bonariensis is a fast-growing perennial in the Verbenaceae family. It reaches around 1.5 m tall and 50 cm wide at maturity, with semi-deciduous foliage. Purple flowers appear for much of the year.
Where to grow Purpletop Vervain
Purpletop Vervain suits warm-temperate, subtropical and Mediterranean climates and grows best in full sun. It is frost hardy and shrugs off cold winters. It also is a genuinely water-wise choice.
Soil & planting
Most soils suit Purpletop Vervain provided drainage is reasonable. Dig in plenty of compost before planting, water in well, and mulch to keep roots cool.
Watering & feeding
Purpletop Vervain performs well with relatively little water once established. A light spring feed is usually enough to maintain steady growth. New plantings need closer moisture checks in hot or windy weather, with watering tapered once strong new growth appears.
Pruning & care
Prune Purpletop Vervain after flowering to keep it compact and encourage the next flush of blooms. Once established, it is low maintenance.
Using Purpletop Vervain in the garden
Purpletop Vervain earns its place for attracting butterflies, feeding bees and pollinators, cut flowers for the vase and a feature or specimen planting.
Companion planting & design
For easier irrigation and care, group Purpletop Vervain with species that also favour low water use and warm-temperate climate. Leave enough room for the mature spread so neighbouring plants are not crowded out.
Good to know
Be aware it can self-seed or spread into bushland in some regions — check it is not a declared weed in your area before planting.
Buying Purpletop Vervain
Plant Sale lists Purpletop Vervain as potted plants. Catalogue forms are planning guidance until the Plant Sale team confirms live availability.
