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| Hardiness zone | 4 | | Maximum height | 50 cm / 20" | | Maximum width | 60 cm / 24" | | Exposure | Sun | | Plants attracting birds | No | | Fragrant plants | No | | Notes : Spikes of rich, dark violet-blue flowers from June to August. Ideal for borders. Reblooms if dead-headed. Perennial of the year 1997. |
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