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Blue Polemonium caeruleum 'Bambino Blue' (Jacob's Ladder) flowers grown in the borders at RHS Garden Harlow Carr, Harrogate, Yorkshire, England Stock Photo - Alamy
Polemonium yezoense var. hidakanum Bressingham Purple ('Polbress')|Hokkaido Jacob's ladder [Bressingham Purple]/RHS Gardening
Polemonium yezoense var. hidakanum 'Purple Rain'|Hokkaido Jacob's ladder 'Purple Rain'/RHS Gardening
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