Clethra alnifolia 'Ruby Spice' is a compact deciduous shrub celebrated for its rich rose pink flower spikes and sweet fragrance. Blooming in midsummer, it draws pollinators and adds multi sensory appeal to wet or shady spots in the garden.
Height & Spread: 4 - 6 ft x 4 - 5 ft
Bloom Time: Mid to late summer
Light Requirements: Full sun to part shade
Soil Preference: Moist to wet, acidic soils
Watering Needs: High; prefers consistently moist soil
Deer Resistance: Moderately resistant
Native Status
This cultivar originates from Clethra alnifolia, a species native to eastern North America, particularly coastal plains and wet woodlands.
WILDLIFE & INSECTS
Bees
- Attracts native bumblebees, sweat bees, and mining bees seeking late summer nectar.
Butterflies
- Draws butterflies such as Eastern Tiger Swallowtail, Silver Spotted Skipper, and Great Spangled Fritillary with its fragrant blooms.
Spacing & Landscape Use
Spacing Recommendations
- Space 4 - 5 ft apart to accommodate mature spread and promote air circulation.
Landscape Placement
- Well suited to rain gardens, foundation plantings, woodland edges, and along water features where consistent moisture is available.
Companion Plants
- Osmunda cinnamomea (Cinnamon Fern) - Brings texture and natural woodland character to the understory layer.
- Asclepias incarnata (Swamp Milkweed) - Adds vertical bloom interest and supports Monarchs alongside Clethra’s pollinator value.
- Lobelia cardinalis (Cardinal Flower) - Contributes bold red spikes and supports hummingbirds in wet soil plantings.
- Carex stricta (Tussock Sedge) - Provides fine texture and moisture tolerance around the base of Clethra.
- Itea virginica 'Henry’s Garnet' - Offers spring bloom and deep red fall color in similar moist shade conditions.