Clethra alnifolia 'Ruby Spice' is a compact shrub with pink and white bottlebrush flowers that are fragrant and nectar-rich.

Clethra alnifolia 'Summer Sparkler' is a compact shrub with long, twisting racemes of white flowers that are fragrant and nectar-rich.

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

Cotyledon tomentosa subsp. ladismithiensis Variegata Group is a succulent shrublet with fuzzy, variegated leaves.

Crinodendron hookerianum is a dense, evergreen shrub with glossy, leathery leaves; producing captivating red, pendulous flowers.

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.

Crocosmia 'George Davidson' has bright orangey-yellow flowers in summer. A magnet for hummingbirds.

Crocosmia masoniorum is a giant montbretia with blazing-orange flowers. A magnet for hummingbirds and butterflies.

An orange version of the popular Crocosmia 'Lucifer' that will draw the hummingbirds just the same.

'Carmine Brilliant' is a stunning Crocosmia with carmine-pink flowers, scarlet-orange on the reverse and with cheery, yellow throats.

Crocosmia 'Fire Jumper' has orange-red buds opening to pale orange flowers highlighted with orange-red.

A hummingbird magnet with red tubular flowers, Crocosmia 'Lucifer' is the best of the genus.

'Ministar' is a short, stout Crocosmia with bright red-orange flowers with orange-yellow throats. Great for hummingbirds.

A short, stout Crocosmia with dragonfire-red flowers. Great for hummingbirds.

Crocosmia 'Okavango' is a hummingbird magnet with apricot-orange tubular flowers.

Crocosmia 'Babylon' has deep reddish orange flowers in summer. A magnet for hummingbirds.

Crocosmia 'Colombus' has bright yellow tubular flowers in summer. A magnet for hummingbirds.

Crocosmia ‘Emily Mackenzie’ offers extra large, dark orange flowers with yellow throats each surrounded by a red ring.

Crocosmia Firestars 'Firestarter' is a montbretia with bright orange-yellow tubular flowers edged and centred with orange-red.

'Gerbe D'Or' produces yellow tubular flowers atop bronze-green Crocosmia foliage.

Crocosmia 'Harlequin' has red and orange buds opening to warm yellow flowers creating a bicolor to tricolor effect.

Crocosmia 'Honey Angels' has bright yellow tubular flowers in summer. A magnet for hummingbirds.

Crocosmia 'Limpopo' has coral orange flowers with a thin orange line down the middle of each petal.