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Campanula trachelium BerniceDouble, deep violet-blue flowers. Upright habit. | Flowering period: May to July. | | Growing conditions: Sun or part shade. | | Typical mature height: 24 inches ( 61 cms ) | | Hardiness: Very hardy. Should withstand severe winters and exposed sites. |  | This is an insect-friendly plant which gives bees and other insects easy access to nectar and pollen. | |
 
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