Gladiolus (Gladiolus grandiflorus)

Gladiolus

Gladiolus grandiflorus

A striking summer bloomer with sword-like foliage and tall flower spikes. Bulbous perennial; other names: sword lily.

Requires full sun for strong, upright stem growth and prolific blooming.
1/week
Moderate
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Plant Needs

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Sunlight Requires full sun for strong, upright stem growth and prolific blooming.
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Watering Keep soil consistently moist during the active growing and blooming season.
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Temperature Prefers warm summer temperatures; corms must be lifted and stored in frost-prone regions.
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Characteristics

  • Leaves: Sword-shaped (ensiform), linear with parallel venation, green, growing in a stiff, fan-like basal arrangement;
  • Flowers: Funnel-shaped, zygomorphic, arranged in a tall, one-sided terminal spike, available in a wide spectrum of colors including red, pink, yellow, and white;
  • Stem: Erect, unbranched, fleshy but sturdy, emerging from an underground corm;
  • Underground: Fleshy corms covered in fibrous, papery tunics.
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Care Guide

Watering

Water deeply once a week, ensuring the soil does not dry out completely while flower spikes are forming.

Fertilization

Apply a balanced fertilizer when shoots first emerge from the soil.. Regular feeding supports the development of large flower spikes.

Banana Peel Tea:Steep chopped banana peels in water for 24-48 hours. Strain and use the liquid to water the base of the plant to encourage robust blooming. Discard solids in compost to avoid attracting pests.
Pruning
  • Cut flower spikes off after blooms fade to direct the plant's energy back into the corm;
  • Leave the foliage intact until it turns completely yellow and dies back naturally;
  • Remove dead foliage only after it easily pulls away from the corm.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Toxic per ASPCA; ingestion of corms or leaves can cause gastrointestinal irritation.

Humans: Corms may cause mild skin irritation upon contact or gastrointestinal upset if ingested.

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Garden Uses & Culture

Culture: Named from the Latin word "gladius" (sword), the gladiolus represents strength of character, faithfulness, and honor in Victorian floriography. It is also the traditional birth flower for the month of August.

Usage: Highly prized as a cut flower for floral arrangements; excellent for adding vertical interest to garden borders.