Gleditsia tri. var. inermis 'Imperial'

Imperial Thornless Honeylocust

Gleditsia triacanthos var. inermis ‘Imperial’ is a compact, thornless deciduous tree valued for its dense, rounded form and refined, fine-textured foliage. Leaves emerge fresh green in spring, provide a fuller, more uniform canopy than most honeylocusts through summer, and turn soft yellow in fall, while blooms are small and not ornamentally significant. Its smaller size and denser habit make it well suited for lawns, patios, and residential landscapes.

Type: Deciduous tree

Mature Size:
Width: 25–35 ft
Height: 30–40 ft
(10-year size: approx. 15–20 ft tall × 12–18 ft wide)

USDA Zones: 4a–9b
Form: Rounded, dense, symmetrical canopy
Light: Full sun
Soil: Highly adaptable; tolerates poor, compacted, and urban soils
Water: Moderate; drought tolerant once established

Wildlife: Attracts bees; provides light habitat for birds


Features & Landscape Uses


Compact, dense canopy for more shade than typical honeylocust



Ideal lawn, patio, or residential shade tree



Clean, refined appearance with fine texture



Good tolerance to urban conditions




Care
Low-maintenance and adaptable. Plant in full sun for best form. Requires minimal pruning; shape lightly as needed. Tolerates heat, drought, and urban stress. Generally pest- and disease-resistant, though may be susceptible to occasional honeylocust pests.

Plant type

Deciduous Tree, Shade Tree

Height

30-40'

Width

25-35'

Hardiness zones

4–9

Sunlight

Full Sun

Growth rate

Moderate

Bloom time

Spring

Leaf color

Green

Fall color

Yellow

Soil

Highly Adaptable, Well Drained

Landscape use

Accent Plant, Specimen, Street Tree

Shape

Broad Upright, Compact, Rounded

Fruit

Yes

Deer resistant

Yes

Salt tolerant

Yes

Drought tolerant

Yes

10-year height

12-18'

10-year width

15-20'