Firespike (Odontonema cuspidatum)

Firespike

Odontonema cuspidatum

Vibrant red spikes light up shade gardens with tropical warmth. Evergreen flowering shrub; common name: firespike.

Partial sun
2/week
Beginner
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Plant Needs

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Sunlight Bright indirect light or partial shade; tolerates full sun with consistent moisture to prevent leaf scorch
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Watering Water when the top 2–3 cm of soil dries out; avoid waterlogging to prevent root rot
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Temperature Thrives in 18–28°C; protect from frost below 10°C to avoid leaf damage
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Characteristics

  • Leaf: Opposite, elliptical to lanceolate, glossy dark green, 10–20 cm long
  • Flower: Dense terminal spikes of tubular bright red flowers, 2–3 cm long
  • Stem: Woody, branching upright stems with smooth green to brown bark
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Care Guide

Watering

Keep soil evenly moist; mist foliage to boost humidity in dry conditions

Fertilization

Feed monthly with balanced diluted liquid fertilizer. Discontinue fertilization during winter dormancy to avoid nutrient buildup

Banana peel tea:Soak 1 chopped banana peel in 1L of water for 24 hours, strain, and use to drench soil; avoid overapplication to prevent excessive potassium levels
Pruning
  • Deadhead spent flower spikes to encourage continuous blooming through the growing season
  • Prune back leggy stems by one-third in early spring to maintain a compact, bushy shape
  • Remove yellow or damaged leaves regularly to improve airflow and overall plant appearance
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed non-toxic to cats; no reported toxicity

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

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden plant; attracts hummingbirds and butterflies for pollination support