Thornless Honeylocust 'Sunburst'

Gleditsia triacanthos var. inermis

Family: Caesalpiniaceae (ses-al-pin-ee-AY-see-ee) (Info)
Genus: Gleditsia (gleh-DIT-see-uh) (Info)
Species: triacanthos var. inermis
Cultivar: Sunburst
Additional cultivar information:(PP1313, aka Suncole)
Hybridized by Cole
Registered or introduced: 1953
View this plant in a garden



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


over 40 ft. (12 m)


15-20 ft. (4.7-6 m)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:

Full Sun



Bloom Color:


Bloom Time:



Grown for foliage


Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Patent expired

Propagation Methods:

From seed; direct sow outdoors in fall

Scarify seed before sowing

By grafting

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Properly cleaned, seed can be successfully stored


This plant has been said to grow in the following regions:

Crestline, California

Clifton, Colorado

Divide, Colorado

Peyton, Colorado

Spring Grove, Illinois

Waterman, Illinois

Valley Lee, Maryland

Jamaica Plain, Massachusetts

Grand Rapids, Michigan

Saint Clair Shores, Michigan

Webb City, Missouri

Middletown, Ohio

Lititz, Pennsylvania

Shelton, Washington

New Glarus, Wisconsin

Watertown, Wisconsin

show all

Gardeners' Notes:


On Aug 13, 2015, Sequoiadendron4 from Lititz, PA (Zone 6b) wrote:

Beautiful and graceful foliage adorn this tree. The chartreuse color lasts for several weeks in the spring before the older leaves start turning a medium green. The tips of the new growth tends to stay the brighter color most of the summer. Limb growth can be quite rapid with some limbs experiencing growth up to 6' per year. Our tree has grown quite large in the matter of 5 years. It's probably 20' tall with a 5" caliper. The new wood is very weak however and it will sag pretty good when it rains. Young trees must be staked as the old wood is generally not strong enough to support the new wood. The tree will change its shape regularly over the summer and 'reset' in the winter when everything hardens up. Despite these things, the tree is fairly strong and the only damage ours has s... read more


On Mar 2, 2015, coriaceous from ROSLINDALE, MA wrote:

All 13 pics show the foliage just after the tree has leafed out in the spring. The chartreuse color fades to the same green as the species fairly quickly. For most of the season, the foliage is mostly green, and only chartreuse near the growing points at the tips of the twigs.

Allergy to the pollen is fairly common.

This cultivar produces few seedpods, which reduces cleanup. Seedlings may not come true. This cultivar is exceptionally susceptible to nectria canker.


On Mar 1, 2015, treetoronto333 from Toronto,
Canada wrote:

Planted in the back corner of my yard about 10 years ago (was about 15 feet at planting). Has poor form and recently suffered from ice damage. It also had aphids in early spring, sometimes taken long to leaf out.


On Oct 24, 2009, Joan from Belfield, ND (Zone 4a) wrote:

Editor's Note

Plant Patent number 1313 has expired