Honey Locust
Gleditsia triacanthos • Fabaceae
🌱 Seed Category
Tree
🌍 Origin Region
Central North America, particularly the Mississippi Valley and Appalachian regions
📅 Days to Maturity
10-15 years to produce first seed pods; 30-50 years for full height maturity.
🌡️ Hardiness Zones
USDA Zones 3-9; hardy deciduous tree.
About This Seed
Seeds are 10-15mm long, oval to oblong, flattened, and dark brown/black with a hard, shiny, water-impermeable coat. The resulting plant is a large deciduous tree reaching 60-100 feet with pinnately compound leaves and twisting seed pods.
Growing Information
Growing Season
Plant in spring after scarification; best started in nursery beds or deep containers
Germination
14-30 days. Requires scarification (boiling water soak or mechanical nicking) due to hard seed coat. Optimal soil temp 20-30°C (68-86°F). High germination rate after treatment.
Planting Instructions
Depth: 1 inch. Spacing: 10-15 feet for groves, 30+ feet for specimens. Prefers deep, moist, fertile loams but is highly adaptable. pH 6.0-8.0.
Sunlight & Water Needs
Full sun. Moderate water; high drought tolerance once established. Tolerates urban pollution and occasional flooding.
Companion Plants
Grows well with grass (lawns) due to light shade; avoid planting near structures if using the thorny wild variety.
Special Characteristics
Fixes nitrogen (though lack of nodules is debated), salt tolerant, highly drought resistant, provides dappled shade, attracts pollinators with fragrant flowers.