Syn Codonopsis grey-wilsonii. This magnificent species is from central and west Nepal in mountain shrubberies. It is the largest flowered Codonopsis I grow with flaring blooms rather than the typical 'bonnet' shape. The colour is exquisite, lavender-blue with a central ring of purple all offset by the nearly black stems. When mature can reach 3m. Full to part shade with a trellis.