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 Hypericum prolificum

Common Name:
Shrubby St. Johnswort

Growth Rate:
Slow to medium

Average Mature Height:

Average Mature Width:

Flower Details:
Bright yellow, 0.75-1" diameter, late June-August

Fruit Details:
A dry, 0.33" long, red-brown to maroon purple, 3-valved capsule; persists all winter, offering a good identification feature. The seeds create a rattle-like noise when shaken.

Fall Color:
No significant fall color

Bark Details:
Light brown, older branches with exfoliating bark.

Disease / Insect Problems or Resistance:
No serious insect or disease problems

Native Habitat:
New Jersey and Iowa to Georgia

Other Features:
Fruit can be dried and used in flower arrangements

Culture and Care:
Adaptable to many conditions, but performs best in dry, rocky, slightly acidic soils.

This plant was blooming:
6/21/2010 - 7/9/2010
7/28/2005 - 8/4/2005

Plantings of this cultivar at Boone County Arboretum:
Bed 59, Bed 184, Bed 204

    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.