Growing and Winterizing Summersweet (Clethra alnifolia) in Syracuse

Summersweet (Clethra alnifolia) is a fantastic native shrub for Syracuse (Zone 5b). Hardy to Zone 4, it thrives in part shade and acidic, moist soil—perfect alongside hydrangeas, azaleas, and blueberries.

Key Features

• Fragrant white or pink summer spikes (July–August) that attract pollinators.
• Glossy green foliage turns golden in fall.
• Slowly spreads by suckers to form a colony.

Winter Care

• No special protection needed. Fully hardy in your zone.
• Apply 2–3 inches of shredded leaf mulch after ground freezes.
• Prune only dead wood in early spring; it blooms on new growth.

Soil Preference

Amend planting hole with peat moss or composted pine bark. Mulch annually with pine needles to maintain acidity.

Summersweet is a low-maintenance, high-reward shrub for shady, damp spots.