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Found growing wild in Sichuan and Yunnan in China, this tuberous perennial's eye-catching flowers appear in mid-summer. They vary in colour from yellow to purple. Plant tubers 15cm (6in) deep in winter or early spring. Grow in moist but well-drained soil in partial shade. A sheltered position is essential as plants are only borderline hardy. Apply a deep winter mulch to protect plants. To propagate divide plants in spring. The Royal Horticultural Society has given it its prestigious Award of Garden Merit (AGM).
Plant type: Summer/autumn blooming bulb
Flower colour: Yellow, Purple
Foliage colour: Mid-green
Sun exposure: Partial shade
Soil: Well-drained/light, Moist
Hardiness: Half hardy
Skill level: Experienced
Time to divide plants: March to May
Time to plant: January to March
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