Kalmia latifolia ‘Stoplight’
Overview
Uses: Woodland borders, foundation plantings, shaded entryways, and naturalized landscapes.
Benefits: ‘Stoplight’ stands out for its vivid red-to-pink bud clusters that remain tightly held rather than fully opening, creating a long-lasting, lantern-like display. Glossy evergreen foliage and a naturally compact habit make it especially well suited for smaller spaces and shaded gardens.
USDA Hardiness Zones: 5–9
Life Cycle: Evergreen Shrub
Sun: Partial Sun/Shade
Mature Height: about 3–4 feet
Mature Width: about 3–4 feet
Bloom Season: Late Spring–Early Summer
Growth Rate: Moderate
Summary
Kalmia latifolia ‘Stoplight’ brings glowing spring color to shade gardens without relying on traditional open blooms.
Instead of opening fully, the vivid ruby-red buds remain clustered and luminous, creating a sculptural display that lasts longer than most mountain laurels. Set against dark, glossy evergreen foliage, the effect feels refined and architectural rather than showy.
The dense, rounded habit fits naturally into woodland borders, shaded foundations, and naturalized plantings, where it provides dependable structure and year-round presence. For gardeners who appreciate subtle drama and evergreen reliability, ‘Stoplight’ offers a distinctive take on a classic native shrub.
Care
Mountain Laurel ‘Stoplight’ Care
Plant in well-drained, slightly acidic soil in a location with morning sun and afternoon shade or bright, dappled light. Protection from intense afternoon sun helps preserve foliage quality and reduce stress.
Water regularly during the first growing season to establish a strong root system. After establishment, maintain consistent moisture without allowing soil to become soggy. A 2–3 inch layer of mulch helps retain moisture and regulate soil temperature; keep mulch a few inches away from the stems.
Feed in early spring with a light application of slow release fertilizer to support healthy foliage and bud development. Avoid heavy fertilization or alkaline amendments.
Prune lightly after the display period if shaping is needed. ‘Stoplight’ sets buds on current-season growth, so late pruning may reduce the following year’s color.
Size
What Size is Mountain Laurel ‘Stoplight’ for Sale Online?
Mountain Laurel ‘Stoplight’ is sold in a grow pot and shipped as a healthy, well-rooted shrub ready to establish after planting. Plant size may vary by season and growing conditions. For current sizing details, please contact us.
How Large Does Mountain Laurel ‘Stoplight’ Grow?
At maturity, this variety typically forms a compact, rounded shrub about 3–4 feet tall and 3–4 feet wide under average garden conditions.
Additional Information
What is unique about Mountain Laurel ‘Stoplight’?
Unlike most mountain laurels, ‘Stoplight’ is grown primarily for its decorative bud clusters rather than open flowers. The tightly held buds provide a longer-lasting and more sculptural spring display.
Is Mountain Laurel ‘Stoplight’ evergreen?
Yes. The foliage remains evergreen, providing year-round structure and color in the landscape.
Is Mountain Laurel ‘Stoplight’ deer resistant?
Mountain laurels are generally considered deer resistant, though browsing can vary based on local pressure.
What soil conditions are best for ‘Stoplight’?
Slightly acidic, well-drained soils are ideal. Avoid compacted or alkaline soils, which can lead to poor growth and leaf discoloration.
How far apart should Mountain Laurel ‘Stoplight’ be planted?
Space plants about 3–4 feet apart on center for individual specimens. For denser groupings, spacing can be reduced slightly.
