Spiral Ginger (Costus speciosus)

Spiral Ginger

Costus speciosus

Spiraling stems carry tropical blooms like tiered candles. Herbaceous perennial ornamental; common name: spiral flag.

Partial sun
2–3/week
Moderate
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Plant Needs

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Sunlight Bright indirect light; tolerates partial shade, avoid harsh midday direct sun that can scorch leaves
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Watering Keep soil consistently moist but not waterlogged; reduce watering frequency during cool, dormant periods
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Temperature Thrives in warm tropical temperatures; protect from frost below 10°C to prevent stem damage
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Characteristics

  • Leaf: Lanceolate, glossy dark green leaves arranged spirally around upright stems
  • Flower: Cone-shaped red bracts with white or pale yellow tubular flowers emerging from the cone’s center
  • Stem: Thick, non-woody, spiral-growing upright stems forming dense clumps
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Care Guide

Watering

Maintain even soil moisture; mist foliage to boost ambient humidity

Fertilization

Feed every 2 weeks with diluted balanced liquid fertilizer. Discontinue fertilization during autumn and winter dormancy

Banana peel compost tea:Soak fully composted banana peels in water for 24 hours; dilute 1:20 with water for root drench to support flower development
Pruning
  • Remove spent flower cones to encourage new bloom production
  • Thin overcrowded clumps in early spring to improve airflow and reduce disease risk
  • Trim back frost-damaged stems to healthy tissue in late winter before new growth emerges
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: No documented toxicity to cats

Humans: No known toxic effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden plant; traditional medicinal uses in some Southeast Asian regions for digestive support