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 Clethra barbinervis

Common Name:
Japanese Clethra

Growth Rate:
Fast growth in youth, ages to moderate growth rate. Rounded habit.

Average Mature Height:

Average Mature Width:

Flower Details:
The slightly fragrant, white, 0.3" diameter flowers are borne in 4-6" long, terminal, racemose panicles from July to August on current season's growth.

Fruit Details:
Small capsules born in long terminal spikes, turn brown in fall.

Fall Color:
Bronze red to maroon, usually not showy.

Bark Details:
Good looking bark, smooth gray to brown, sometimes exfoliating.

Disease / Insect Problems or Resistance:

Native Habitat:
Native to Japan

Other Features:

Culture and Care:
Moist, organic-laden, drained soils in partial shade. Zone 5. Avoid hot, dry sites.

This plant was blooming:
7/28/2005 - 8/4/2005

Plantings of this cultivar at Boone County Arboretum:
Bed 233

    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.