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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names Argentinian vervain purple top
South American vervain tall verbena
Synonyms Verbena bonariensis 'Buenos Aires' Verbena brasiliensis misapplied
Verbena patagonica
Family Verbenaceae
Genus Verbena can be annuals, perennials or sub-shrubs, with toothed or pinnately lobed leaves and small, usually 5-petalled, salver-shaped flowers, typically held in spikes or panicles, in summer or autumn
Details V. bonariensis is a tall perennial with erect, branching stems to 2m in height, bearing sparse, oblong leaves and numerous branched clusters of small, purple flowers from summer to autumn
Plant range South America
Foliage Deciduous
Habit Columnar/Upright
Fragrance Flower
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H4
Full Sun
Aspect South-facing or West-facing
Exposure Exposed or Sheltered
Clay
Loam
Chalk
Sand
MoistureMoist but well-drained, Well-drained
SoilClay, Loam, Chalk, Sand
pHAcid, Alkaline, Neutral
Ultimate height 1.5-2.5 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 2-5 years
Cultivation Grow in moist but well-drained or well-drained, moderately fertile soil in full sun. In cold areas, protect with a dry winter mulch
Propagation Propagate by seed in pots at 18-21°C in autumn to early spring or let it self-seed
Suggested planting locations and garden types Flower borders and beds Wall-side Borders Prairie Planting Gravel Garden City & Courtyard Gardens Coastal Cottage & Informal Garden
Pruning Cut down in spring as new growth emerges from the base; deadhead in autumn if seed is not required
Pests Generally pest free
Diseases Generally disease free
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
Argentinian vervain
Buy from £17.97 at the RHS Plants Shop
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