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This has intense, gentian blue flowers, 2.5cm (1in) across, but it is not reliably hardy. If you're lucky enough to live in a very sheltered area, it should flower in the first year and then produce tubers and spring back to life the following year, with a good display of blooms. Where it can be treated as hardy, grow it in containers, rock gardens and the border. Otherwise, grow it in a greenhouse.
Plant type: Tender perennial
Flower colour: Blue
Foliage colour: Mid-green
Sun exposure: Full sun, Partial shade
Skill level: Experienced
Time to divide plants: March to April
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