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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Cultural Details for Ilex crenata 'Sky Pencil'

Common Name:
Sky Pencil (Japanese) Holly

Growth Rate:
Maintains columnar shape without pruning

Average Mature Height:
10'

Average Mature Width:
2-3'

Flower Details:
Tiny, greenish-white flowers appear along the stems in the leaf axils in late spring

Fruit Details:
'Sky Pencil' is an all-female cultivar which needs a male pollinator in order to produce fruit.If pollinated, the flowers give way to purple, berry-like drupes (1/4" diameter) in fall. Flowers and fruit are inconspicuous.

Fall Color:

Bark Details:

Disease / Insect Problems or Resistance:
Spider mites can be troublesome. Nematodes are a problem in the South.

Native Habitat:
An introduction of the U.S. National Arboretum in Washington, D.C.

Other Features:
This evergreen Japanese holly cultivar is an exceedingly narrow, fastigiate form which grows somewhat slowly in a vertical, pencil-like column to 10' tall but only 2-3' wide.

Culture and Care:
Easily grown in average, medium, well-drained soils in full sun to part shade. Tolerant of a wide range of growing conditions, including urban pollution. Prefers light, moist, acidic soils with good drainage. Chlorosis can occur on alkaline soils

This plant was blooming:

Plantings of this cultivar at Boone County Arboretum:

    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