Giant Swamp Lily (Crinum jagus)

Giant Swamp Lily

Crinum jagus

Its towering blooms carry sweet, heady fragrance over wetland edges. Bulbous perennial aquatic herb; common names: Giant Lily, Swamp Lily.

Full sun
3–4/week
Moderate
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Plant Needs

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Sunlight Full to partial sun; tolerates dappled shade in hot climates, but bright light is required for consistent flowering
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Watering Thrives in consistently moist or shallow standing water; avoid allowing the bulb substrate to dry out completely
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Temperature Prefers warm tropical to subtropical temperatures; protect from frost and temperatures below 10°C to prevent bulb damage
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Characteristics

  • Leaf: Long, strap-like glossy green leaves up to 1.5 m long, arching outward from central bulb
  • Flower: Umbel of 10–20 trumpet-shaped white blooms with pale pink stamens, producing strong sweet fragrance
  • Bulb: Large fleshy underground bulb with fibrous, water-adapted roots
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Care Guide

Watering

Keep substrate fully saturated or submerged in 5–10 cm of standing water

Fertilization

Diluted balanced liquid feed every 2 weeks. Avoid high-nitrogen fertilizers to prevent excessive leaf growth at the expense of flowering

Composted banana peel tea:Steep fully composted banana peels in water for 3 days; dilute 1:20 with water for root drench to support healthy blooming without causing nutrient burn
Pruning
  • Remove spent flower stalks after blooming to redirect energy to bulb growth
  • Trim brown or yellowing leaf tips to maintain a tidy appearance and prevent fungal growth
  • Divide overcrowded bulb clumps in early spring to promote better air circulation and flowering
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; lycorine exposure leads to vomiting, diarrhea, lethargy, and abdominal pain

Humans: Contains lycorine alkaloids; ingestion causes gastrointestinal irritation, nausea, and abdominal cramps

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental wetland plant; fragrant cut flower for floral arrangements