Summersweet

Growing & care

• Sun: full sun to full shade — one of the few flowering shrubs that blooms well even in considerable shade.
• Water: prefers consistently moist to wet, acidic soil; native to swamps and pond edges. Tolerates average soil with watering but not prolonged drought.
• Soil: moist, rich, acidic. Tolerates clay and salt spray, making it valuable for coastal gardens.
• Hardiness: USDA zones 3–9.
• Mature size: 3–8 feet depending on cultivar ('Hummingbird' compact, 'Ruby Spice' pink); spreads by suckers into colonies.
• Pruning: prune in late winter or early spring — it blooms on new wood, so this does not sacrifice flowers.

Propagation

Softwood cuttings root readily in early summer. It also spreads by suckers that can be dug and divided, and self-sows from the seed capsules. Named cultivars are propagated by cuttings to keep their size and flower color.

Common problems

Summersweet is remarkably trouble-free and one of the few shrubs that combines fragrant late-summer bloom, shade tolerance, wet-soil tolerance, and salt tolerance. Its main quirk is suckering into wide colonies in moist ground — welcome for massing, but it may spread in small beds. Spider mites can appear on plants stressed by drought. Leaves may yellow (chlorosis) in alkaline soil. Non-toxic to dogs and cats, deer-resistant, and an outstanding native shrub for shade, wet sites, coastal gardens, and supporting late-season pollinators when little else is in bloom.