Honey Locust
Gleditsia triacanthos · Deciduous broadleaf hardwood
Plant Family
Fabaceae
Tree Category
Shade Tree / Street Tree
Variety / Cultivar
Gleditsia triacanthos var. inermis (thornless variety commonly planted in urban landscapes)
Hardiness Zones
USDA Hardiness Zones 3 through 9, demonstrating high adaptability to varying temperature extremes and urban heat islands
About This Tree
A medium to large deciduous tree featuring an open, spreading, and somewhat vase-shaped or rounded canopy that casts light, dappled shade. Known for rapid growth, graceful fine-textured foliage, and adaptability to difficult urban conditions.
Leaf Characteristics
Pinnately or bipinnately compound leaves consisting of numerous small, oval to lance-shaped leaflets about 0.5 to 1.5 inches long with finely toothed or smooth margins. Leaves emerge light yellowish-green, mature to a bright medium green, and turn a subtle yellow in autumn before dropping cleanly.
Bark Characteristics
Dark gray to brownish-black bark that is relatively smooth on young trees, developing shallow longitudinal fissures and narrow, scaly ridges with age. Wild types often feature formidable branched thorns, though cultivated street trees are typically thornless.
Growing Information
Origin Region
Central North America, well-adapted across eastern and central United States and widely planted in urban environments globally
Growing Season
Spring leaf-out relatively late, small greenish-yellow fragrant flowers in late spring, long leathery seed pods developing in summer and persisting into winter, entering dormancy in late autumn
Sunlight & Water Needs
Requires full sun for optimal growth and foliage color. Highly drought-tolerant once established and adapts well to a wide range of soil moisture conditions, though prefers well-drained soils.
Mature Size
Expected mature height of 50 to 70 feet with a comparable spread, fast growth rate, and a typical lifespan of 100 to 120 years
Special Characteristics
Exceptional tolerance to urban pollution, poor soils, compacted earth, road salt, and drought. The fine foliage requires minimal raking in autumn, and thornless cultivars eliminate safety hazards.
Wildlife & Ecology
Provides modest food and shelter for local birds and small mammals through its seed pods and open branching structure. Its nitrogen-fixing legume family characteristics contribute to soil health.