Kalmia latifolia
Mountain-laurel

 Plant Type:
 Growth Forms:
 Hardiness:
 Deciduous / Evergreen:
 Flower Notes:
White (Spring; interesting flower buds open to 0.75-1" dia. flowers (each with purple markings within) in 4-6" dia. terminal flower clusters (corymbs))
 Foliage Notes:
Green (2-5" long and leathery and yellowish beneath)
 Fruit Notes:
Brown (5-valved capsule; not ornamentally important)
 Ultimate Height:
7-15 feet
 Ultimate Spread:
7-15 feet
 Soil Notes:
Prefers rich, acidic, well drained soil with a layer of mulch on top to keep roots cool
 Diagnostic Characteristics:
Leaves 4" long, dark-green above and yellowish below. Buds have two scales. No terminal bud as in Rhododendrons.

Additional Information

Mountain-laurel is an Ericaceous broadleaf evergreen shrub with an abundance of interesting flower buds and stunning flowers in the spring. Site and exposure requirements similar to Rhododendron, that is, acidic, well drained soil and at least light protection from afternoon sun in winter for best results. Mulch to keep roots cool. Hardiness varies widely with geographic source of genetic material. Does not tolerate extremely dry conditions. Flowering is reduced by shade, but deadheading enhances flowering for the following summer. Foliage toxic to livestock. Leafspot can be problem.

Other plants like this Kalmia latifolia (Mountain-laurel)

The Purdue Arboretum is a collaboration between the Department of Horticulture and Landscape Architecture and Physical Facilities Grounds Department

Purdue Arboretum, 625 Agriculture Mall Dr, West Lafayette, IN, 47907
© 2025 Purdue University | An equal access/equal opportunity university | Integrity Statement | Copyright Complaints | Maintained by the Purdue Arboretum
Contact Purdue Arboretum at arboretum@purdue.edu for accessibility issues with this page | Accessibility Resources | Contact Us