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As perhaps can be gathered from the name, this is a particularly fine variety of the clustered bellflower. A vigorous plant, splendid for the border, it bears large heads of dark, purple-violet flowers in early summer and often again later if dead-headed promptly. 'Superba' has been given an Award of Garden Merit (AGM), which is for plants of outstanding excellence.
Plant type: Hardy perennial
Flower colour: Purple
Foliage colour: Mid-green
Sun exposure: Full sun, Partial shade
Soil: Well-drained/light, Chalky/alkaline
Skill level: Beginner
Time to divide plants: March to April
Flowering period: June to August
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