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Campanula glomerata 'Superba' (C. g. dahurica superba) / Clustered Bellflower

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     Campanula glomerata 'Superba' (C. g. dahurica superba)
 
Hardiness zone 3
Maximum height 60 cm / 24"
Maximum width 30 cm / 12"
ExposureSun / Half-shade
Plants attracting birdsNo
Fragrant plantsNo
Notes : Clusters of rich violet-blue flowers from June to end of july. Very tolerant to heat.