Batten Blooms
PL. —Verbena bonariensis 'Bampton'Botanical illustration — drop image
Verbena bonariensis 'Bampton'

Verbena 'Bampton'

SpringSummerFall
4a–10bHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Peak bloom
Summer
Peak bloom
Fall
Peak bloom
Peak bloom
In bloom
Background

Verbena bonariensis 'Bampton' is a compact selection of tall verbena, a South American short-lived perennial prized for its dense clusters of small purple flowers on slender, branching stems. It reaches roughly half the height of the straight species, making it easier to place in mixed borders without staking. Butterflies and bumblebees work the flowers heavily from midsummer into fall, and the semi-transparent stems give it a see-through quality useful for layering in front of taller plants.

The plant self-seeds freely, but seedlings often revert toward the taller species form; remove unwanted volunteers before they establish. In zones 7 and warmer it behaves as a true perennial; in colder regions it functions as a self-seeding annual. Lean to average, sharply drained soil keeps growth upright — overly fertile soil produces floppy stems. Mulch crowns in zones 5–6 over winter to improve survival rates.

Good companions
ZinniaCosmosWhirling ButterfliesEnglish Lavender
Care guide
SunFull sun
WaterLow
SoilWell-drained, average to lean
Spacing18–24 in
Height24–36 in
Zone4a – 10b
Direct sow
Seasonal tasks
winter
sowStart seeds indoors under lights, pressing them onto the soil surface without covering — seeds require light to germinate. Maintain 65–70°F soil temperature.
spring
cutPinch or shear young plants back by one-third once they reach 8–10 in to encourage branching and a bushier habit.
sowTransplant hardened-off seedlings into the garden after the last frost date, spacing 18–24 in apart in full sun.
summer
watchMonitor for powdery mildew during dry spells with poor air circulation. Thin congested plants and avoid overhead irrigation.
cutIf flowering slows at midsummer, cut stems back by half to basal growth to trigger a new flush before fall.
fall
watchAllow a portion of seed heads to ripen for self-seeding, but remove excess seedlings promptly — they may not come true to the compact 'Bampton' form.
cutAfter hard frost, cut stems to a few inches. In zones 5–6, mulch crowns with 3–4 in of straw or shredded leaves for winter protection.
Common problems

Powdery mildew

Symptoms

White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.

Downy mildew

Symptoms

Yellowing on top of leaves with grey-purple fuzz underneath. Spreads rapidly in humid conditions.

Treatment

Remove affected leaves. Improve air circulation. Avoid overhead watering. Copper spray as preventive.

Botrytis (grey mould)

Symptoms

Grey fuzzy mould on petals and stems, worst in cool wet conditions.

Treatment

Remove affected parts immediately. Improve air circulation. Avoid overhead watering. Apply copper fungicide if severe.

Root rot

Symptoms

Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.

Treatment

Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.