Boone County Arboretum
9190 Camp Ernst Road
Union, Kentucky 41091
Phone: (859) 384-4999
Fax: (859) 384-6888

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Cultural Details for Gleditsia triacanthos var. inermis

Common Name:
Thornless Honeylocust

Growth Rate:
Fast, 2' or more per year.

Average Mature Height:

Average Mature Width:

Flower Details:
Polygamo-dioecious, perfect and imperfect flowers on same tree, greenish-yellow blooming from May-June. Fragrant and nectar laden.

Fruit Details:
pod, reddish-brown to blackish, strap-shaped, 7-18" long, 1" wide, seeds oval, shiny dark brown, hard.

Fall Color:
Clear yellow to yellow-green

Bark Details:
On old trees grayish-brown, broken up into long, narrow, scaly ridges which are seperated by deep furrows

Disease / Insect Problems or Resistance:
leaf spot, cankers, witches' broom, powdery mildew, rust, honeylocust borer, midge pod gall, webworm and spider mites

Native Habitat:
Pennsylvania to Nebraska and south to Texas and Mississippi

Other Features:
Gives filtered shade but overused and disease prone.

Culture and Care:
Highly adaptable to a wide range of conditions, drought tolerant, high pH, salt tolerant, full sun, prune in fall.

This plant was blooming:

Plantings of this cultivar at Boone County Arboretum:
60, 70, 80, 90

    The information on this page may have come from one or more of the following sources:
  • Dirr, Michael. Manual of Woody Landscape Plants. Stipes Publishing. 1998.
  • Hightshoe, Gary L. Native Trees, Shrubs, and Vines for Urban and Rural America. John Wiley & Sons. 1988.
  • North Carolina Extension Plant Fact Sheets.
  • University of Connecticut Plant Database.