Corn Flag (Gladiolus communis)

Corn Flag

Gladiolus communis

Its sword-shaped leaves hold tall spires of ruffled blooms, a garden staple of summer color. Perennial cormous flowering plant; common name: sword lily.

Full sun
2–3/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 shaded planting locations
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Watering Keep soil consistently moist during the active growing season; avoid waterlogging to prevent corm rot
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Temperature Thrives in 15–25℃ during growth; dormant corms tolerate light frost down to 5℃ when stored properly
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Characteristics

  • Leaf: Linear, sword-shaped bright green leaves arranged in flat, fan-like basal clusters
  • Flower: Ruffled funnel-shaped blooms in pink, purple, white, or red, borne on unbranched vertical spikes
  • Corm: Underground storage organ covered in a brown papery tunic
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Care Guide

Watering

Water deeply 2–3 times weekly to keep soil evenly moist

Fertilization

Apply balanced liquid fertilizer every 2 weeks to support bloom development. Use a low-nitrogen fertilizer to promote flower production over leaf growth

Banana peel compost tea:Compost banana peels for 2 weeks, steep in water, dilute 1:20 for root drench; avoid raw peels to prevent pest infestations and odor
Pruning
  • Deadhead spent blooms promptly to redirect energy to corm growth instead of seed production
  • Cut back foliage only after it turns completely yellow and dies back naturally to allow nutrient transfer to corms
  • Remove damaged or diseased leaves immediately to prevent spread of fungal pathogens
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic due to alkaloid content; may cause vomiting, diarrhea, abdominal pain, and lethargy

Humans: Ingestion of large amounts may cause mild gastrointestinal upset including nausea and vomiting

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Garden Uses & Culture

Culture: Symbolizes strength, integrity, and remembrance in Western floral traditions

Usage: Ornamental garden plant, cut flower for floral arrangements