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| Hardiness zone | 4 | | Maximum height | 3m / 10' | | Maximum width | - / - | | Exposure | Sun / Half-shade | | Plants attracting birds | Yes | | Fragrant plants | No | | Notes : A popular introduction from Holland. Double dark blue to purple flowers in June and again in September. New in 2000, very popular, one of the best double flowering. Pruning group B. |
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