Clethra barbinervis (Japanese Clethra)
Slow-growing, Clethra barbinervis (Japanese Clethra) is a large deciduous shrub or handsome small tree of upright-spreading habit boasting large, drooping panicles, 4-6 in. long (10-15 cm), of pleasantly fragrant white flowers. Blooming from mid to late summer, they nod forward and gently twist in graceful horizontal sprays, when few other shrubs or trees are in bloom. They are very attractive to bees, butterflies, and other pollinators and give way to spikes of dark brown fruits which persist into winter, providing continuing interest. The serrated, glossy, dark green leaves, 2-6 in. long (5-15 cm), turn bright golden-yellow in fall, before falling to the ground, revealing the richly colored exfoliating bark. Equally remarkable, the bark is smooth, polished, exquisitely mottled cinnamon, salmon buff, and slate gray. A wonderful, trouble-free shrub with four seasons of interest that is perfect for moist, slightly acidic, well-drained soils. Excellent as a specimen plant or in small groupings.
- Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society.
- Grows up to 10-20 ft. tall (3-6 m) with a spread of 10-15 ft. (3-4.5 m).
- This plant is best grown in full sun to part shade in average, medium to wet, slightly acidic, well-drained soils. Full shade is tolerated.
- Mass in mixed shrub borders for dramatic summer blooms. Great flowering shrub for shade or woodland gardens or along stream banks or ponds.
- This plant enjoys excellent resistance to pests and diseases.
- Prune immediately after flowering. Propagate by seed or softwood cuttings.
- Native from Eastern China to Japan.
Requirements
Hardiness | 5 – 8 |
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Heat Zones | 6 – 8 |
Climate Zones | 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 |
Plant Type | Shrubs, Trees |
Plant Family | Clethra |
Exposure | Full Sun, Partial Sun, Shade |
Season of Interest | Spring (Early,Mid,Late)Summer (Early,Mid,Late)FallWinter |
Height | 10' – 20' (3m – 6m) |
Spread | 10' – 15' (3m – 4.5m) |
Spacing | 120″ – 180″ (300cm – 450cm) |
Water Needs | Average |
Maintenance | Low |
Soil Type | Clay, Loam, Sand |
Soil pH | Acid |
Soil Drainage | Moist but Well-Drained |
Characteristics | Fragrant, Plant of Merit, Showy |
Attracts | Bees, Butterflies |
Garden Uses | Beds and Borders, Ponds and Streams |
Garden Styles | Informal and Cottage |