Dark Mullein (Verbascum nigrum)

Dark Mullein

Verbascum nigrum

Tall spires of golden blooms rise like sunlit torches. Biennial or short-lived perennial herb; common name: Dark Mullein.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun exposure for optimal flowering; tolerates partial shade but produces fewer blooms in low light
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Watering Water deeply when the top 5–7 cm of soil is dry; avoid overwatering to prevent root rot in poorly drained soil
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Temperature Hardy to -15°C; thrives in cool to temperate conditions; avoid prolonged extreme heat above 32°C
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Characteristics

  • Leaf: Basal rosette of fuzzy, ovate to lanceolate leaves; stem leaves smaller, clasping the upright stem
  • Flower: Dense terminal spikes of small golden-yellow five-petaled blooms with dark purple stamens
  • Stem: Erect, densely covered in grayish-white woolly hairs to reduce water loss
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Care Guide

Watering

Keep soil evenly moist during active growth and blooming

Fertilization

Light top-dressing with compost in early spring if soil is very poor. Over-fertilization reduces flower production and increases susceptibility to disease

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 with water before applying as a root drench
Pruning
  • Deadhead spent flower spikes promptly to encourage secondary blooming and prevent self-seeding if desired
  • Remove yellowing basal leaves in late summer to improve airflow and reduce fungal risk
  • Cut back the entire plant to the basal rosette after flowering to promote overwintering
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic; no risk of poisoning for cats

Humans: Non-toxic to humans; no known adverse health effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden plant for cottage gardens; traditional medicinal use for respiratory support