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Verbascum

Verbascum thapsus

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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.

Verbascum

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

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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.