Kalmia latifolia 'Stoplight'
Overview
Uses: Woodland borders, foundation accents, shaded entryways, and naturalized plantings.
Benefits: Striking red-to-pink clustered bud displays that hold tight rather than fully opening; glossy evergreen foliage; compact habit for small spaces.
USDA Hardiness Zones: 5 – 9
Sun: Partial Sun/Shade
Life Cycle: Broadleaf evergreen shrub
Mature Height: ~3' – 4'
Mature Width: ~3' – 4'
Bloom/Display Season: Late Spring to Early Summer (decorative bud clusters with occasional open blooms)
Growth Rate: Moderate
Summary
Bring a burst of glowing color to your shade garden—no blooms required. ‘Stoplight’ Mountain Laurel stands out for its vivid, ruby-red buds that stay clustered and luminous, creating the look of hundreds of tiny lanterns glowing against dark evergreen foliage.
Unlike traditional mountain laurels that open fully, ‘Stoplight’ holds its clusters tight, producing a longer-lasting, more sculptural display through late spring and early summer. The dense, rounded habit fits beautifully in woodland borders, shaded foundations, and naturalized plantings where it adds texture and steady color. Pair it with ferns, azaleas, or heuchera for a sophisticated contrast that thrives in dappled light.
If you love the refined look of mountain laurel foliage and want dependable spring interest without waiting for full blooms, ‘Stoplight’ delivers understated elegance and season-long appeal.
Care
Mountain Laurel 'Stoplight' Care
Plant in well-drained, slightly acidic soil and choose a site with morning sun and afternoon shade or bright dappled light. Protection from intense afternoon heat helps preserve foliage color and prevents stress during summer months.
Water regularly during the first growing season to establish a strong root system, then maintain consistent moisture—never soggy. A 2–3" layer of mulch helps keep roots cool, retain soil moisture, and regulate temperature. Keep mulch a few inches back from the stems to prevent rot.
Feed in early spring with an acid-loving slow release fertilizer to encourage healthy foliage and strong bud formation. Avoid heavy fertilization or alkaline amendments, as these can cause leaf yellowing and poor bud development.
Prune lightly after the display period if shaping is desired. ‘Stoplight’ sets next season’s buds on current-year wood, so trimming too late may reduce next year’s color. With minimal pruning and proper light, this variety maintains a naturally dense, rounded form.
Size
Size of Mountain Laurel 'Stoplight' for Sale Online
Our plants ship in greenhouse-grade grow pots and are appropriately sized for their containers. For current pot sizes and availability, please contact us.
Size of Mountain Laurel 'Stoplight' When Mature
Expect a compact, rounded shrub approximately 3' – 4' tall and 3' – 4' wide at maturity under average garden conditions.
Additional Information
What is the botanical name of Mountain Laurel 'Stoplight'?
The botanical name is Kalmia latifolia ‘Stoplight’.
Does 'Stoplight' open like other mountain laurels?
No—‘Stoplight’ is primarily a bud-cluster display. Most buds remain attractively clustered with only occasional individual flowers opening.
Is Mountain Laurel 'Stoplight' evergreen and deer resistant?
Yes—foliage is evergreen, and mountain laurels are generally considered deer resistant.
What soil is best for 'Stoplight'?
Acidic, well-drained soils are ideal. Avoid alkaline or compacted soils.
How far apart should I plant Mountain Laurel 'Stoplight'?
Space 3' – 4' on center for individual specimens; for a denser row, plant about 2.5' apart on center.
