Verbascum

Verbascum thapsus

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verifiedReviewed by the GreenScout Team

A tall, distinctive biennial or short-lived perennial with thick gray-green fuzzy leaves and dense spires of bright yellow flowers on towering stems reaching 3–6 feet. Verbascum is drought-tolerant once established and attracts pollinators; it self-seeds readily and thrives in poor, well-drained soils. Traditionally used in herbal preparations, it's valued for both ornamental and medicinal applications.

Common Problems

Select the problem your Verbascum is experiencing to get a treatment guide.

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Root Rotchevron_right

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Overwateringchevron_right

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Boltingchevron_right

Care Guide

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Light

Full sun (6–8 hours minimum); essential for flowering and plant vigor

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Water

Low water once established; water during establishment and drought; prefers dry to moderate moisture; drought-tolerant

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Soil

Well-draining, poor to moderately fertile soil; tolerates sandy, gravelly, or rocky soil; prefers slightly alkaline to neutral pH (6.5–7.5)

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Fertiliser

Minimal fertilizer needed; avoid excessive feeding which promotes soft growth; use low-nitrogen fertilizer if needed

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Temperature

Hardy biennial/perennial; tolerates cold winters and hot, dry summers

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Humidity

Low humidity preferred; dislikes wet conditions; excellent in arid climates

Toxicity

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Generally safe; some sources note leaves may cause mild skin irritation in sensitive individuals

Common Diseases

filter_dramaRoot Rotchevron_right spaPowdery Mildewchevron_right grainLeaf Spotchevron_right

Common Pests

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Seasonal Care

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Resume regular watering and feeding as growth picks up.

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Peak growing season. Water and feed regularly.

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Reduce watering as growth slows. Stop heavy feeding.

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Minimal watering and feeding. Protect from frost if needed.

Frequently Asked Questions

How tall does Verbascum actually grow?

It's a distinctive biennial or short-lived perennial that can reach 3–6 feet, with dense spires of bright yellow flowers towering over its thick, fuzzy gray-green leaves.

Does Verbascum have any traditional uses beyond the garden?

Yes — it has traditionally been used in herbal preparations, making it valued for both ornamental and medicinal applications, in addition to attracting pollinators in the garden.