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| Hardiness zone | 4 | | Maximum height | 2,5m / 8' | | Maximum width | - / - | | Exposure | Sun / Half-shade | | Plants attracting birds | No | | Fragrant plants | No | | Notes : Deep purple-blue 18-20 cm (7-8"), semi-double flowers in May and June, then single in September. Highly recommanded. Pruning group B. |
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