Sword Lily (Gladiolus hortulanus)

Sword Lily

Gladiolus hortulanus

Tall spires of ruffled blooms cut a regal figure in summer gardens. Herbaceous perennial flowering bulb; common name: sword lily.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Requires full direct sunlight for at least 6 hours daily to support robust blooming; avoid partial shade which may reduce flower production
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Watering Water deeply when the top 5 cm of soil is dry; avoid overwatering to prevent corm rot and fungal growth
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Temperature Thrives in 18–25°C during active growth; corms require 5–10°C for winter dormancy to prepare for spring sprouting
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Characteristics

  • Leaf: Linear, sword-shaped, bright green, arranged in flat fan-like clusters at the base
  • Flower: Ruffled, funnel-shaped blooms in dense terminal spikes; available in pink, red, yellow, white, purple
  • Corm: Underground storage structure with a fibrous, papery tunic
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Care Guide

Watering

Keep soil consistently moist during active growth and blooming; reduce watering as foliage begins to yellow

Fertilization

Apply balanced liquid fertilizer every 2 weeks when shoots emerge. Avoid high-nitrogen fertilizers which may promote foliage growth over flowering

Banana peel compost tea:Compost banana peels for 2–3 weeks, steep in water for 24 hours, dilute 1:20 with water, and apply as a root drench to support flower development
Pruning
  • Deadhead spent blooms promptly to encourage extended flowering and prevent seed formation
  • Cut back yellowing foliage to 5 cm above corms after blooming to redirect nutrients to the underground storage structure
  • Remove damaged or diseased leaves to reduce the risk of fungal infections
  • Lift corms in autumn in regions with freezing winters; clean and store in a cool, dry location until spring planting
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion may cause vomiting, diarrhea, abdominal pain, and lethargy

Humans: Ingestion of corms or foliage may cause mild gastrointestinal upset including nausea and diarrhea

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Garden Uses & Culture

Culture: Symbolizes strength of character, remembrance, and sincere infatuation in Western floral traditions

Usage: Popular cut flower for floral arrangements; used as a border plant in formal garden designs