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.

Crinum amoenum has fragrant, white spidery flowers atop strap-like leaves.

Crinum campanulatum has tropical-looking, fragrant, amaryllis-like flowers that can be white or pink, deepening with age.

Crinum graminicola is a rare species from South Africa with huge umbels of light pink to deep pink flowers and dramatic foliage.

Crinum macowanii is a hardy species with broad, rippled, blue-green foliage and large, highly fragrant, white and pink flowers.

Crinum moorei 'Album' has fragrant, white, amaryllis-like flowers that grace this South African native in early summer.

Crinum moorei 'Album' has fragrant, white, amaryllis-like flowers that grace this South African native in early summer.

So underused but so beautiful in our summer gardens. Crinum 'Ellen Bosanquet' looks like a lovely pink amaryllis.

Crocus ancyrensis 'Golden Bunch' is among the earliest to bloom in the late winter garden with an abundance of orange-yellow flowers.

Crocus angustifolius is known as the "cloth of gold crocus" with golden orangey-yellow flowers with bold purple markings.

Crocus biflorus ssp. weldenii 'Fairy' is a beautiful cultivar with ivory white inner petals and pewter purple outer ones.

Crocus chrysanthus 'Advance' has lovely lemon yellow flowers with a purple flush on the outside.

Crocus chrysanthus 'Blue Marlin' is a delicately coloured cultivar with white to palest lavender interiors and grape purple striped petals.

Crocus chrysanthus 'Fuscotinctus' is a beautiful cultivar with deep golden yellow flowers striped with burgundy red.

Crocus chrysanthus 'Gipsy Girl' has lovely yellow to deep yellow petals with deep purple to purplish-brown feathing on the outer tepals.

Crocus chrysanthus 'Herald' has lovely yellow to deep yellow petals with deep purple reverses.

Crocus chrysanthus 'Prins Claus' is a snow crocus with large, white and purple, cup shaped flowers.

Crocus chrysanthus 'Romance' sports two colours of yellow: light, creamy yellow and rich, deep buttery yellow.

Crocus corsicus flowers are bright lilac-pink on the inside and light pink on the outside with dark purple feathering.

Crocus korolkowii has orange-yellow flowers with burgundy black bases and the outer petals flecked with burgundy.

Crocus malyi has icy white petals with yellow centres, yellow stamens, and orange pistils.

Crocus minimus hails from Corsica and Sardinia with lavender flowers, the reverses feathered with royal purple.