Codonopsis Grey-Wilsonii

These climbers bear the largest flowers of all codonopsis, each flared sky-blue star having a central eye, delicately pencilled in violet and mauve, and being up to 2 inches (5cm) wide or more. Unusually, the individual flowers on the vine can vary tremendously in size. These superb plants are tuberous herbaceous perennials that can twine to a height of at least 3m when mature, the tubers usually flowering in their second or third year from seed.