Named for the Kiyosumi mountain area in Japan, 'Kiyosumi' (also 'Kiyosumi-sawa-ajisai') is a Mountain Hydrangea (Hydrangea serrata) cultivar that captures the purity of mountain streams. This refined species brings delicate beauty to the woodland garden.
| Family: | Hydrangeaceae (hy-drain-jee-AY-see-ee) |
| Genus: | Hydrangea (hy-DRAIN-juh) |
| Species: | serrata (sair-AY-tuh) |
| Cultivar: | 'Kiyosumi' |
| Synonym: | 'Kiyosumi-sawa-ajisai' |
Hydrangea serrata 'Kiyosumi' grows 2-4 feet tall with the species' characteristic smaller leaves and delicate lacecap flowers. The blooms are typically white or pale pink/blue, with a clear, fresh quality evocative of mountain springs. This species is often more cold-hardy and sun-tolerant than H. macrophylla.
Culture: part shade to full sun (with moisture), moist well-drained acidic soil. Prune lightly after flowering. Hardy zones 5-9. 'Kiyosumi' brings the clarity of Japanese mountain water to the garden.
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