Numerous lovely, fragrant, gentian blue flowers top the delicate, dissected foliage in spring.

Corydalis flexuosa Hillier 'Porcelain Blue' produces clusters of fragrant, glowing blue flowers atop finely textured foliage.

Bronze-green foliage with red highlights and stems and large blue to purple-blue flowers.

Corydalis flexuosa 'Royal Purple' has red-marked leaves and sky blue and light purple, fragrant flowers.

Corydalis lutea has clusters of bright yellow, spurred flowers that bloom above blue-green foliage for months on end.

Corydalis ochroleuca is smothered in fragrant, creamy white, tubular flowers with yellow at the centres for months.

Corydalis quantmeyerana 'Chocolate Star' has reddish chocolate-brown foliage three seasons of the year with great lavender flowers in spring.

Corydalis solida 'Beth Evans' is an exquisite spring ephemeral with masses of pink tubular flowers. Choice.

Corydalis solida 'Firebird' is the best red Corydalis, producing sweetly fragrant flowers above finely dissected, fern-like foliage.

Corydalis 'G.P. Baker' has amazing near-red flowers atop delicate bluish-green foliage in spring.

Corydalis solida 'Purple Bird' has warm purple flowers atop delicate bluish-green foliage in spring.

Corydalis solida 'White Knight' is an exquisite spring ephemeral with masses of pure white tubular flowers. Choice.

Corydalis Blue Line 'Couriblue' produces clusters of glowing blue, honey-scented flowers on cinnamon stems atop finely textured, blue-green leaves.

Cosmos atrosanguineus has flowers that smell like dark chocolate! Resistance is futile. 'Choca Mocha' cosmos is more compact with a stronger fragrance.

Cosmos peucedanifolius 'Flamingo' is a hardy cosmos with large, 3 inch wide, pink, flowers produced in great profusion through summer atop beautifully dissected foliage.

Cotyledon orbiculata 'Mucronata' forms short stems of large, fan-shaped, succulent, silver leaves with heavily-ruffled margins.