Gladiolus Corms
Gladiolus x hortulanus • Iridaceae
🌱 Seed Category
Flower
🌍 Origin Region
Mainly South Africa, with species also from Tropical Africa, Asia, and Mediterranean Europe.
📅 Days to Maturity
70 to 90 days from planting to first flower spike bloom.
🌡️ Hardiness Zones
USDA Zones 7-10 (Perennial); Zones 3-6 (Annual, requires lifting/storage over winter).
About This Seed
The seeds (corms) are brown, rounded, bulb-like structures covered in fibrous, papery tunics. The resulting plant grows from 2 to 5 feet tall with sword-shaped green leaves and tall spikes of funnel-shaped flowers in a wide variety of colors excluding true blue.
Growing Information
Growing Season
Spring planting for summer bloom. Not frost-hardy in cold climates (lift in fall).
Germination
Corms typically sprout in 10-15 days once soil temperatures reach 60°F (15°C). No pre-treatment required.
Planting Instructions
Plant 4-6 inches deep and 4-6 inches apart in well-drained soil. Soil pH should be 6.0 to 7.0. Stagger planting every 2 weeks for continuous blooms.
Sunlight & Water Needs
Full sun (6-8 hours daily). Requires consistent moisture, approximately 1 inch of water per week, but must have well-drained soil to prevent rot.
Companion Plants
Beneficial companions include Zinnias, Dahlias, and Roses. Avoid planting near legumes (beans/peas) as they may share common viral pathogens.
Special Characteristics
Excellent cut flower, attracts pollinators like hummingbirds and bees, and is generally deer resistant. Variety of colors available via selective breeding.