Boerhaave's Mullein (Verbascum boerhavii)

Boerhaave's Mullein

Verbascum boerhavii

Its tall golden spires brighten dry fields with understated grandeur. Mediterranean biennial herb of the Scrophulariaceae family; other names: Boerhaave’s mullein.

Full sun
1/week
Beginner
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Plant Needs

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Sunlight Prefers full sun; tolerates light shade but flowers best in direct sunlight
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Watering Drought-tolerant; water sparingly once established
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Temperature Thrives in temperate climates; tolerates mild frost
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Characteristics

  • Leaves: Large basal rosette, lanceolate, up to 30 cm long, densely covered with woolly hairs;
  • Flowers: Bright yellow, five petals, arranged in a long terminal spike, about 2–3 cm across;
  • Stems: Tall, erect, unbranched, densely woolly;
  • Fruits: Ovoid capsules with numerous small seeds.
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Care Guide

Watering

Water moderately if prolonged drought

Fertilization

Light compost dressing before flowering. Requires little fertilization; organic compost once a season is sufficient

Composted banana peel:Dry and crush banana peels; mix into soil near base; avoid fresh peels to prevent pests
Pruning
  • Remove spent flower spikes to encourage prolonged bloom;
  • Cut back dead stems in autumn;
  • Remove damaged basal leaves to reduce disease risk;
  • Thin overcrowded seedlings for stronger growth;
  • Deadhead to prevent self-seeding if undesired.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: No toxicity reported per ASPCA for Verbascum spp.

Humans: No significant toxicity reported; parts have been used in traditional medicine

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Garden Uses & Culture

Culture: In European rural lore, mulleins were seen as protective plants against evil spirits and a sign of summer fields.

Usage: - Ornamental accent in wildflower meadows; - Traditional herbal uses for respiratory relief; - Drought-resistant landscaping.