Summer Sparkler Summersweet
Summer Sparkler Summersweet
Fragrant White Spikes for the Shady, Damp Garden
Summer Sparkler Summersweet (Clethra alnifolia) lights up the late-summer landscape with a flush of fragrant, creamy-white flower spikes just as most shrubs have gone quiet. Compact and rounded, it's built for the moist, shaded spots that frustrate other plants, and its honey-sweet scent draws butterflies and bees from across the yard. A tough, native-type shrub that earns its place in Minnetonka, Blaine, and Lakeville beds.
| Attribute | Detail |
|---|---|
| Botanical Name | Clethra alnifolia |
| Mature Size | 3–4 ft tall and wide |
| Hardiness Zone | Zone 3–9 (fully hardy across Minnesota) |
| Light | Full sun to part shade; tolerates shade |
| Bloom Time | Mid to late summer (July–August) |
| Flower Color | Fragrant white spikes |
| Soil | Moist to wet; tolerates clay and poor drainage |
Landscape Uses
Use Summer Sparkler in rain gardens, along pond and stream edges, in shaded foundation plantings, or massed as a fragrant informal hedge. It mixes well with ferns, hostas, and astilbe, and finishes the season with golden-yellow fall color.
Best Time to Plant
Plant from spring through early fall. Spring planting uses Minnesota's naturally moist soils, while planting six or more weeks before hard frost ensures roots establish before winter.
How to Plant
Dig a hole twice as wide as the root ball and equally deep. Set the crown level with the soil line, backfill, water deeply, and mulch 2–3 inches deep, keeping mulch off the stems.
Watering
First Year: Water deeply 2–3 times weekly and keep the soil consistently moist.
After Year One: Water weekly and more in heat. Summersweet loves moisture and shrugs off wet soil.
Drip Irrigation: A drip line or soaker hose keeps the root zone evenly damp through the growing season.
Frequently Asked Questions
Is Summer Sparkler hardy in Minnesota?
Yes. Summersweet is rated to Zone 3 and overwinters dependably statewide.
Does it tolerate wet soil?
Absolutely. It's one of the best flowering shrubs for rain gardens and damp, poorly drained spots.
Will it bloom in shade?
Yes. Bloom is heaviest in sun to part shade, but it flowers in shade better than most shrubs.
Is it deer resistant?
Yes, deer usually pass it by.
You May Also Like
Pair Summer Sparkler with our shade and rain-garden shrubs, or browse the full Summersweet collection for compact and pink-flowering choices.