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Purpletop Vervain
Verbena bonariensis
Easy · Beginner friendlyAbout Purpletop Vervain
Tall Verbena or Purpletop Vervain is a South American perennial grown as an annual in colder zones, with airy 3 to 6 foot stems topped by small lavender-purple flower clusters. A designer cottage-garden staple prized for its see-through airy habit that weaves between other plants, beloved by butterflies and hummingbirds. Self-sows freely.
- Drought-tolerant
- Deer-resistant
- Pollinator-friendly
How to care for Purpletop Vervain
Watering
- Springevery 7 days
- Summerevery 5 days
- Fallevery 10 days
- Winterevery 21 days
Soil · Well-draining
- Top dressingPine bark mulch10%
- Main mixPotting soil + perlite 2:170%
- DrainageLECA / gravel20%
Never skip the drainage layer — standing water is the top cause of root rot.
FERTILIZER
Balanced Feed 14-14-14
An even feed covers all three needs at once, keeping leaves, roots and blooms moving together with nothing pushed out of balance.
- Nitrogen · Leaves
- Phosphorus · Roots + Blooms
- Potassium · Strength
- Springevery 60 days
- Summerevery 30 days
At a Glance
- NativeSouth America
- Height4–6 ft (1.2–1.8 m)
- Spread1.5–3 ft (0.5–0.9 m)
- Flower colorPurple
- Foliage colorGreen
- SoilLoamy, Well-drained
- LocationsYard
Bloom time
BLOOM CYCLE
Peak bloom
Jul–Nov
Airy purple flower clusters July to frost
Fragrance
LIGHT FRAGRANCE
Flowers have a light, subtle scent.
Toxicity
No toxicity has been reported for this plant. Still, it is wise to keep pets from chewing on any houseplant.
Educational information, not medical or veterinary advice. If exposure is suspected, contact a doctor or veterinarian.
DISTRIBUTION
- Native
- Introduced
- South America
History
Verbena bonariensis, commonly called tall verbena, Argentinian vervain, or purpletop vervain, is an erect perennial native to tropical South America, with the epithet bonariensis honoring Buenos Aires, Argentina. Linnaeus described the species in 1753 from cultivated European specimens that had arrived from the La Plata basin. The plant's slender stems reach two meters and carry airy terminal clusters of small lavender-purple flowers that attract butterflies and hummingbirds throughout summer and fall.
Although an heirloom cottage garden subject for centuries, the species surged in popularity beginning in the 1990s when Dutch plantsman Piet Oudolf and British gardeners including Beth Chatto and Dan Pearson featured it prominently in the New Perennial movement, using its transparent vertical structure in drifts among prairie grasses. It self-seeds readily.
Native to Argentina and Brazil, introduced to American gardens in the 1970s through British designer plantings featuring it at Great Dixter and Chelsea. Became the defining see-through annual of modern American cottage and naturalistic gardens.
Symbolism & meaning
What It Symbolizes
Purpletop Vervain embodies ethereal grace, its tall see-through stems lifting tiny purple flower clusters high above the border like floating dots of color. As one of the top butterfly nectar plants, it earns the affectionate title 'butterfly altar' for the worshipful clouds of fritillaries and swallowtails that gather around it. This is the perennial of airy beauty — a plant that lets you see through it while still pulling every winged thing toward its blooms.
- Ethereal grace — see-through airy stems floating above border
- Butterfly altar — top butterfly nectar plant
Where the Name Comes From
The common name highlights its purple coloring. 'bonariensis' refers to Buenos Aires, Argentina, where the species was first collected.
Uses & Fun Facts
- Purpletop Vervain perennial used in cottage and naturalistic borders
- Airy purple clusters lift nectar above the border for butterflies and bees
- Tall airy stems thread purple color through meadow plantings
Related plants
More Verbena plants
Rose VervainVerbena canadensis
Common VervainVerbena officinalis
Slender VervainVerbena rigida
Garden VerbenaVerbena x hybrida
Plants with similar care
Chinese AbeliaAbelia chinensis
Fragrant AbeliaAbelia mosanensis
Large-Flowered AbeliaAbelia uniflora
Glossy AbeliaAbelia x grandiflora
Frequently asked questions
How often should I water Purpletop Vervain?
In summer, water about every 5 days; in winter, about every 21 days. Adjust for heat, pot size and drainage.
How much light does Purpletop Vervain need?
Full sun: 6+ hrs direct. Watch the leaves — scorching or stretching means the light needs adjusting.
Is Purpletop Vervain toxic to cats or dogs?
No toxicity has been reported for this plant. Still, it is wise to keep pets from chewing on any houseplant. Educational information, not medical or veterinary advice. If exposure is suspected, contact a doctor or veterinarian.
Is Purpletop Vervain easy to grow?
Yes — it is considered an easy, beginner-friendly plant.
When does Purpletop Vervain bloom?
It typically blooms Jul–Nov in the Northern Hemisphere.
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