Corydalis flexuosa was a great introduction in the 1990s, and it has also given rise to several excellent hybrids. They are all plants with delicate foliage growing through the winter, after a dormant season in late summer. Then in spring the stems are topped with the distinctive blue flowers, over a long flowering period. Each will soon form a good patch, which can be split to provide a lovely ground cover between shrubs.

Corydalis 'Spinners' is an excellent, vigorous hybrid, in appearance closer to C. elata than to flexuosa, with fresh green, ferny foliage and indigo blue flowers, which have the additional attraction of being scented.