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

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Dawn - Dusk
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Cultural Details for Clethra alnifolia 'Hummingbird'

Common Name:
Hummingbird Summersweet Clethra

Growth Rate:

Average Mature Height:
30-40"

Average Mature Width:

Flower Details:
Perfect, white, 5-petaled, delightfully fragrant, 0.33" across, June into July. Borne on current season's growth in 5-7" long upright panicles.

Fruit Details:
Dry, 3-valved, dehiscent, pubescent capsule, 0.125" in diameter. Persists through winter.

Fall Color:
Pale yellow to rich golden brown mid-October through mid-November.

Bark Details:
Brown, pubescent, rounded or obscurely 3-sided; light brown, continuous pith.

Disease / Insect Problems or Resistance:
Tremendously pest-free, although mite damage can be seen in dry conditions.

Native Habitat:
Maine to Florida to coastal Texas.

Other Features:

Culture and Care:
Moist, acid soil, partial shade or full sun. Spreads vigorously by rhizomes and forms large colonies.

This plant was blooming:
7/9/2010 - 8/5/2010
7/28/2005 - 8/4/2005

Plantings of this cultivar at Boone County Arboretum:
Bed 88

    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. www.ces.ncsu.edu
  • University of Connecticut Plant Database. www.hort.uconn.edu