Boone County Arboretum
9190 Camp Ernst Road
Union, Kentucky 41091
Phone: (859) 384-4999
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Cultural Details for Kalmia latifolia 'Heart of Fire'

Common Name:
Heart of Fire Mountain-laurel, Spoonwood, Calico bush, Lambkill

Growth Rate:
Slow, 4-8' over 10 years

Average Mature Height:
7-15', can grow 30-36'

Average Mature Width:
7-15', can grow 30-36'

Flower Details:
Red buds, deep pink flowers, 0.75-1" across, broad campanulate (bell-shaped)

Fruit Details:
Brown, 5-valved, dehiscent capsule, 0.25" across, persistent through winter

Fall Color:
Evergreen, dark green, if in sun- yellowish green

Bark Details:
Gray brown, striated to lightly ridged and furrowed

Disease / Insect Problems or Resistance:
Leaf spot, blight, flower blight, whitefly, scale, lacebug, azalea stem borer, and rhododendron borer

Native Habitat:
Appalachian Mountains-North Carolina

Other Features:
Selected from 'Ostbo Red' seedling population for better foliage and habit. Gnarly and crooked branches are used for rustic mountain furniture, poisonous if ingested

Culture and Care:
Easy to transplant, roots require acidic, cool, moist well-drained soil, full sun or deep shade, flowers best in full sun, remove faded flowers, use pine bark mulch to keep soil moist. Zone 4-9.

This plant was blooming:
4/19/2010 - 5/19/2010
5/20/2005 - 5/27/2005

Plantings of this cultivar at Boone County Arboretum:
Bed 32

    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.