Are all honey locust trees thorny?

No, many modern cultivars are specifically bred to be thornless.

Does this tree fix nitrogen?

Despite being in the legume family, it does not fix nitrogen.

Plant guide

Honey locust.

Gleditsia triacanthos

Pronounced gle-DIT-see-uh try-uh-KAN-thos

Also known as Common Honey-locust, Common Honeylocust, Honey Locust, Honey shuck, Honey-Locust, Honey-chuck, Honeylocust, Sweet Locust

The honey locust is a hardy, fast growing deciduous tree known for its delicate, fern like foliage. It is a popular choice for urban landscapes because it tolerates pollution and poor soil conditions well. You will often find thornless varieties available for residential planting.

At a glance

Care level: Easy
Plant type: Deciduous tree
Light: Full sun
Indoor light: Direct sun
Water: Every 7 to 14 days
Mature size: 15 to 25 meters
Growth rate: Fast
Hardiness: USDA 3 to 9
Bloom time: Late spring to early summer

Care

This tree is quite adaptable, but it performs best with consistent moisture while young. Watch for signs of pests like spider mites or leaf hoppers during dry spells. Pruning is best done in late winter while the tree is dormant.

Watering: Water deeply during the first few years to establish a strong root system.
Feeding: Apply a balanced fertilizer in early spring before new growth begins.
Pruning: Prune in late winter to remove dead wood and maintain a desirable shape.
Repotting: Repotting is generally only applicable for young container specimens.
Soil: Well drained, adaptable to various types
Soil pH: Acidic to alkaline
Temperature: -35 to 40°C
Humidity: 30 to 70%
Drought tolerance: High
Lifespan: Perennial, typically 70 to 120 years.
Fragrance: Light
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Water running straight through the pot without soaking in.

Safety

People: The plant is not considered toxic to humans, though the pods can be a choking hazard.
Pets: The seeds and pods can be toxic to pets if ingested in large quantities.
Children: The large, sharp thorns pose a significant injury risk to children climbing or playing near the tree.
Contact allergens: The sharp thorns can cause puncture wounds and skin irritation.
Airborne allergens: The pollen can trigger mild seasonal allergies in sensitive individuals.
Edibility: The pulp inside the seed pods is technically edible but often unpalatable and not recommended for consumption.

How to identify it

Compound leaves with small leaflets
Long, flattened, dark brown seed pods
Rough, gray to brown bark
Often features large, branched thorns

Height: 15 to 25m
Spread: 10 to 20m
Leaves: green, yellow, deciduous
Flowers: green, yellow, 0.5 to 1cm
Fruit: brown, Autumn

Problems to watch for

Mimosa WebwormCommon
CankerUncommon
Leaf ScorchUncommon
Root RotRare

By symptom

Plant problems by symptom

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Growing it

Propagation: seed, cuttings
When to plant: spring, autumn
Overwintering: No special protection is needed as it is fully hardy, but ensure the tree is well watered before the ground freezes.
In containers: It is not suitable for long term container growth due to its large size and extensive root system.

Seed Scarification

Scarify the hard seed coat by nicking it with a file or soaking in hot water.
Soak seeds in water for 24 hours to soften the coat.
Plant in a well draining potting mix at a depth of 1 centimeter.
Keep the soil consistently moist until germination occurs.

Plant shade-tolerant perennials beneath the canopy to take advantage of the filtered light.

Grows well with

Daylily · They tolerate the light shade provided by the tree canopy.
Coneflower · These perennials thrive in the same sunny, well-drained conditions.

Similar species

Black Locust · Often confused due to similar names, but it has different flowers and leaves.

Science

Family: Fabaceae
Genus: Gleditsia
Order: Fabales
Class: Magnoliopsida
Native range: Central and eastern United States.
Conservation: This species is common and not of conservation concern.

It is a pioneer species that thrives in disturbed areas and open fields.

Value to wildlife: nectar source, nesting site
Pollinators: bees
Uses: shade tree, street tree, erosion control, timber

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 4/9
Soil reaction: 6/9
Light: 8/9
Moisture: 5/9
Nutrients: 5/9
Temperature: 6/9

Taxonomy resolved against GBIF.

Questions people ask

Are all honey locust trees thorny?: No, many modern cultivars are specifically bred to be thornless.
Does this tree fix nitrogen?: Despite being in the legume family, it does not fix nitrogen.

Where the name comes from

The common name refers to the sweet, honey-like pulp found in the pods, while the scientific name describes the three-pronged thorns.

Good to know

The thorns were historically used as nails or pins by early settlers.
The species name triacanthos means three-thorned.
Honey locust wood is very durable and rot-resistant.
Thornless cultivars are widely used in urban landscaping.

Also in

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.