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| Hardiness zone | 4 | | Maximum height | 3m / 10' | | Maximum width | 2m / 7' | | Exposure | Sun / Half-shade | | Plants attracting birds | Yes | | Fragrant plants | No | | Notes : The best known of all the doubles. 15-20 cm (6-8") double flowers in a violet blue with reddish overtones in May and June, followed by single flowers in a luminous light violet in August-Sept. Pruning group B. |
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