Ruby Spice Summersweet (Clethra alnifolia ‘Ruby Spice’) is a deciduous, native shrub prized for its fragrant rose-pink flower spikes, compact habit, and ability to thrive in moist, shady areas. As the darkest-pink flowering Clethra available, this standout cultivar adds rich color, strong fragrance, and pollinator value to gardens from mid to late summer.
Distinctive Features
‘Ruby Spice’ produces dense, upright spikes of spicy-scented, deep rose-pink flowers that emerge in mid-summer and continue blooming into early fall. Unlike many pink-flowering Clethra, the color of ‘Ruby Spice’ remains strong and saturated throughout the season. Its lustrous green foliage turns a clear yellow in fall, and its compact, suckering habit makes it excellent for naturalistic borders and mass plantings.
Growing Conditions
Sun Exposure: Full sun to partial shade
Soil: Prefers moist, acidic soils; tolerant of sandy, loamy, or clay conditions
Water: Moderate to high; thrives in consistently moist soil
USDA Hardiness Zones: 49
Ideal Uses
Focal Point: Showy pink flowers and fragrance create a striking seasonal highlight
Rain Gardens: Performs exceptionally in wet or low-lying areas
Pollinator Gardens: Attracts bees, butterflies, and hummingbirds
Foundation Planting: Adds color and texture beneath windows and along structures
Naturalized Landscapes: Spreads slowly to fill woodland edges or shaded understory
Low Maintenance Care
Watering: Maintain consistent soil moisture, especially in dry weather
Pruning: Prune lightly after flowering if shaping is desired
Fertilizing: Apply a balanced fertilizer in early spring if needed
Mulching: Mulch to conserve moisture and improve soil structure
Protection: Avoid alkaline soils and dry, exposed sites
Why Choose Ruby Spice Summersweet?
Deep Rose-Pink Flowers: Rich, fragrant blooms offer late-summer color
Compact Native Shrub: Tidy habit fits well in smaller gardens or shaded beds
Pollinator Magnet: Excellent source of nectar for late-season visitors
Moisture Tolerant: Thrives in wet or poorly drained soils
Focal Point: Bold flower color and scent make it a standout in seasonal landscapes
Clethra alnifolia ‘Ruby Spice’ combines strong pink bloom color, summer fragrance, and ecological value in a compact, moisture-loving native shrubperfect as a focal point or background plant in pollinator-friendly, woodland, or rain garden settings.
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