Clethra alnifolia 'Summer Sparkler' with flower buds in 3-gallon pots.
Yellow fall foliage of Clethra alnifolia 'Summer Sparkler'.

Clethra alnifolia 'Summer Sparkler' (Dwarf Summersweet)

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Clethra alnifolia 'Summer Sparkler', is a coastal wetland shrub native to the eastern United States commonly referred to as 'Summer Sparkler' summersweet or sweet pepperbush. As for most summersweet, the real draw for 'Summer Sparkler' is the flowers, and this cultivar does not disappoint, with a profusion of fragrant white flower spikes that occasionally reach over a foot in length. Flowers bloom through the summer months and are attractive to pollinators of all kinds, but especially butterflies and hummingbirds. While this cultivar draws is name from the similarity of its flower spikes to sparkler fireworks, one other common name is 'Einstein summersweet,' and it's easy to see the resemblance there as well.

'Summer Sparkler' summersweet is a standard sized Clethra variety, and grows to three to eight feet tall with a spread of four to six feet wide. Since most Clethra alnifolia are multi-stemmed, it is important to choose a large enough planting location, but this cultivar displays beautifully when planted in mass, when mixed into perennial borders, or when used in rain gardens or wetland restoration projects. Naturally found in coastal wetland areas or floodplains, Clethra alnifolia grows best in wetter areas with acidic, sandy soils and full sun exposure, but is not at all picky, and will tolerate drier soils as well as perpetually wet clay soils, and even those with some salt content.

Native to Eastern Shore, Native to Maryland, and Native to U.S.
Mature Plant Height: Medium: 30-48"
Sun to Shade-Wide Tolerance
Soil Moisture: Medium to Wet
Soil Type: Acidic and Sand
Bloom Time: Summer
Flower Color: White
Foliage color: Green
Features: Attracts Butterflies, Attracts Pollinators, Attracts Hummingbirds, Host Plant for Butterflies or Moths, Fall Color, Fragrant, and Erosion Control
Tolerances: Clay Soil Tolerant, Wet Soil Tolerant, Shade Tolerant, Flood Tolerant, Salt Tolerant, and Deer Tolerant
Garden Type: Pollinator Garden, Rain Garden, Woodland Garden, Small Space, Wetland Restoration, and Border/Screen

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