Key Facts
- Deciduous medium to large tree in the legume family
- Native to central North America and widely planted as an urban tree
- Produces pinnate or bipinnate leaves that turn yellow in fall
- Late spring flowers develop into long pea like pods that persist into fall
- Many wild trees have stout thorns but common landscape cultivars are thornless
- Tolerates a wide range of soils and is drought tolerant once established
- Used as a street and shade tree because of fast growth and high tolerance of urban conditions
- Some cultivars are thornless and seedless and are propagated clonally
Honey Locust is a fast growing, deciduous legume commonly planted for street trees and shade. It has compound leaves that turn yellow in fall and produces late spring flowers followed by long pea like pods that often persist into autumn.
Identification
Medium to large deciduous tree with pinnate or bipinnate leaves that yellow in autumn. Late spring flowers develop into long, pea like pods that often remain on the tree into fall. Wild trees frequently have stout thorns while many landscape cultivars are thornless. Typical height ranges from about 30 to 70 feet and spread commonly 20 to 50 feet.
Where to grow and common uses
Native to central North America and widely used as a street and shade tree because of fast growth and tolerance of urban soils and compaction. It prefers full sun for best form and flowering but tolerates light shade. Hardiness generally spans USDA zones 3 to 9 with variation by provenance and cultivar.
Planting and spacing
Space trees according to mature spread, typically 20 to 50 feet apart for single specimens or street plantings. Plant with the root flare at or slightly above the final soil grade to avoid burying the trunk. Planting season varies by climate; establish young trees during the milder planting window in your region to reduce transplant stress.
Soil light and watering
Prefers well drained soils but tolerates clay, compacted and alkaline conditions. Avoid persistently wet sites because poor drainage can cause root decline and reduced vigor. Honey Locust becomes drought tolerant once established; short term water stress reduces new growth and can thin the crown over time.
Maintenance and pruning
Prune to develop a single clear trunk and a well spaced scaffold for urban shade use. Remove suckers and rootstock shoots promptly when grafted cultivars are used to maintain desired traits. After flowering there is little required care beyond occasional shaping and removing crossing or dead branches as needed.
Propagation
Propagate by seed, grafting or cuttings. Seed often requires scarification and sometimes cold stratification for reliable germination. Named thornless or seedless cultivars are commonly propagated clonally by grafting or budding to preserve traits because seedlings can revert or vary.
Risks and wildlife interactions
Pods were used historically as food and are eaten by wildlife and livestock but large quantities might cause mild gastrointestinal upset. Thorns on wild trees can cause mechanical injury. In warmer parts of its range trees that set seed freely can naturalize, so remove seedlings if spread is unwanted.
Frequently asked questions
- How fast does Honey Locust grow?
- Honey Locust is considered fast growing and is often chosen to provide quick shade in urban and landscape plantings.
- What USDA zones does Honey Locust grow in?
- Hardiness is generally reported as USDA zones 3 to 9 with some variation by provenance and cultivar; cold sites near the lower limit may show slower growth or winter dieback.
- Are Honey Locust pods or foliage toxic?
- Gleditsia species are not widely listed as highly poisonous. Pods have been eaten historically but large amounts may cause mild gastrointestinal upset. Check local extension or poison control for specific guidance for pets and livestock.
- Do Honey Locust trees sucker or become invasive?
- Some forms can spread by seed and root suckering, especially in warmer zones or when rootstock suckers are left unchecked. Remove seedlings and suckers to control naturalizing.
- Are thornless Honey Locust cultivars available?
- Yes. Many landscape cultivars are thornless and some are propagated to be seedless; these are usually produced clonally by grafting or budding to preserve thornless traits.
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