Honey Locust

Scientific Name: Gleditsia triacanthos
Common Names: Honey Locust
Thorny Locust
Févier Épineux
Family: Caesalpiniaceae (Cassia Family)
Native Range: Extreme southwestern Ontario; native to eastern North America; commonly planted beyond its range in southern Ontario
Typical Height: ~30 m (98.5 ft)
Maximum Recorded Height: 85 feet though some have gotten 80-100 feet.
Trunk Diameter: ~90 cm (the tree in Madina County, Ohio has a diameter of 225 inches... Approx. 6 feet across).
Growth Rate: Medium
Lifespan: Typical 90 years
Seed Maturity: 3–5 years
Reproductive Cycle: Most years; fruit persists into winter
Soil Preferences: Moist, rich bottomlands; tolerant of drought as well as alkaline soils; requires full sun
Water Needs: Prefers moist conditions; drought-tolerant once established
USDA/Canadian Hardiness Zones: CA4, NA3

Key Attributes
Fire Resistance: Low unless prescribed burns and suppression to prevent dense understory (fuel).
Fire Regeneration: Aggressive sprouting from roots, this can actually increase fire risk due to thorny thickets that spread fire..
Shade Tolerance: Low.. intolerant of shade
Strength Rating: Heavy, hard, strong wood; decay-resistant
Decay Resistance: High
Pest/Disease Resistance: Susceptible to pests in some locations.
Climate Adaptability: Tolerates urban stress, drought, and alkaline soils
Uses: Ornamental; landscape tree; provides light shade; wildlife food source from seeds and pods
Ecological Role: Supports mammals and birds through seeds and pods; stabilizes rich bottomlands; spreads via sprouts
Cultural/Historical Significance: Popular urban tree for lawns and streets; some cultivars bred for yellow foliage or thornlessness
Bark: Young trees smooth, brown; mature trees deeply furrowed with scaly ridges
Leaves: Alternate, singly or doubly pinnately compound; singly compound with 14–30 leaflets, doubly compound with 4–7 pairs of branches; leaflets 25–40 mm long, rounded with small point, sometimes minutely toothed
Flowers: Greenish-white, small (~5 mm), insect-pollinated; pollen and seed flowers on same tree, often separate branches; appear in spring with leaves
Fruiting: Pods 15–40 cm long, flat, curved, twisted; leathery husk; fall in winter without opening
Seeds: Bean-like, hard, impermeable coat; remain viable for many years in cool, dry conditions; germination enhanced by chilling, boiling water, or acid treatment
Growth Form: Medium-sized, broad open crown; often bears long branched thorns; short trunk; deep, wide-spreading root system with root hairs
Reproductive Features: Insect-pollinated; seed pods persistent; vegetative reproduction via sprouts; some cultivars flower only with pollen and do not bear fruit
Unique Features: Branched thorns on trunk and branches; pods twisted and persistent; most landscaping cultivars thornless and fruitless; excellent lawn tree due to light shade. One of the few species with root hairs.

Additions
Foliage Details: Bright green, pinnately compound; singly or doubly compound; 14–30 leaflets
Cones/Fruits: Large, flat, twisted pods; persist after leaf-fall
Bark: Smooth young bark; scaly-ridged mature bark
Threats: Pests may attack; thorns can limit use in urban plantings
Carbon Sequestration: Moderate; medium-sized, fast-growing tree