Einstein Summersweet

Einstein Summersweet (Clethra alnifolia 'Einstein')

Einstein Summersweet (Clethra alnifolia 'Einstein') is a compact, deciduous shrub prized for its upright, white flower spikes and fragrant late-summer bloom. This native cultivar features an unusually dense flowering habit, with upright floral wands that resemble sparks of white light, earning it the name 'Einstein.' Its compact size and tidy form make it especially useful in foundation plantings, rain gardens, and pollinator-focused landscapes.

Distinctive Features

'Einstein' is known for its narrow, upright flower spikes that bloom prolifically from mid to late summer. The pure white flowers are fragrant and densely packed, held above glossy, dark green foliage that remains attractive throughout the season. As a native cultivar, it also offers excellent wildlife value, attracting bees, butterflies, and other pollinators while resisting deer browse.

Growing Conditions

• Sun Exposure: Full sun to partial shade
• Soil: Moist, acidic, well-drained to wet soils; thrives in clay and sandy loam
• Water: Moderate to high; prefers consistently moist soils
• USDA Hardiness Zones: 4�9

Ideal Uses

• Focal Point: Vertical flower spikes and fragrance make it an eye-catching accent
• Foundation Planting: Compact habit and clean foliage suit structured plantings
• Rain Gardens: Thrives in moist, low-lying, or periodically wet soils
• Pollinator Gardens: Highly attractive to bees, butterflies, and hummingbirds
• Naturalized Areas: Native habit fits well in woodland edges or under larger trees

Low Maintenance Care

• Watering: Maintain consistent moisture, especially in full sun or dry spells
• Pruning: Prune after flowering if needed to maintain shape or size
• Fertilizing: Use a slow-release fertilizer in early spring if growth is weak
• Mulching: Mulch to retain moisture and enrich the soil
• Protection: Avoid dry, alkaline sites for best performance

Why Choose Einstein Summersweet?

• Prolific White Flowers: Upright spikes of fragrant white blooms cover the plant in late summer
• Compact and Upright: Tidy form ideal for smaller garden spaces
• Native Species: Supports pollinators and wildlife with ecological benefits
• Moisture Loving: Excellent option for rain gardens and wet sites
• Focal Point: Dense, candle-like blooms create standout seasonal interest

Clethra alnifolia 'Einstein' delivers fragrance, pollinator value, and bold summer blooms in a compact native shrub�perfect as a low-maintenance focal point in wet or shaded garden settings.