Troubleshooting
Tall Verbena problems — and how to fix them
Tall Verbena (Verbena bonariensis) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Winter loss
Borderline hardy and can die in cold, wet winters, especially in heavy soil. Grow in free-draining ground and rely on its prolific self-seeding.
Powdery mildew
Whitish coating in humid, still or shaded sites. Site in full sun with good airflow and avoid overcrowding.
Self-seeding spread
Seeds about freely and can become weedy or invasive in mild climates. Deadhead or hoe out unwanted seedlings to control it.
Flopping in shade or rich soil
Stems lean when light is low or feeding is heavy. Give full sun and lean soil, or grow through neighbouring plants for support.
Prevent tall verbena problems before they start
Most tall verbena issues are care-mismatch, not bad luck. Dial in the basics:
Looking for tall verbena in general rather than its problems? Read the full tall verbena care guide — light, water, soil and feeding.
Tall Verbena problems — FAQ
Why is my tall verbena winter loss?
Borderline hardy and can die in cold, wet winters, especially in heavy soil. Grow in free-draining ground and rely on its prolific self-seeding.
Why is my tall verbena powdery mildew?
Whitish coating in humid, still or shaded sites. Site in full sun with good airflow and avoid overcrowding.
Why is my tall verbena self-seeding spread?
Seeds about freely and can become weedy or invasive in mild climates. Deadhead or hoe out unwanted seedlings to control it.
Why is my tall verbena flopping in shade or rich soil?
Stems lean when light is low or feeding is heavy. Give full sun and lean soil, or grow through neighbouring plants for support.