Clematis 'Super Nova' is a cold-hardy climber with large, single white flowers, dark purple margins and veining.

Clematis 'The First Lady' offers very large flowers in silvery blue to white with light greenish bands and pretty purple stamens.

Clematis 'The President' has large, deep purple-blue flowers and striking red-tipped stamens.

Clematis 'Toki' is an elegant Japanese cultivar with pure white 5-7 inch wide flowers and yellow stamens.

Clematis 'Walter Pennell' is a unique cultivar in both colour and form with interesting shades of pink on semi-double flowers.

Clematis 'Warsaw Nike' has rich velvet purple flowers illuminated with a magenta glow around yellow stamens.

Clematis 'Will Goodwin' has beautiful ruffled lavender-blue flowers with cream coloured stamens.

Codonopsis clematidea produces pale blue, bell-shaped flowers yellow, orange, dark purple, and maroon inside.

Coleus scutellarioides Under the Sea 'Lime Shrimp' is a tender tropical with lobed lime-green and burgundy foliage.

Coleus scutellarioides Under the Sea 'Pink Reef' is a tender tropical with lobed pink and burgundy foliage.

Colocasia exculenta 'Ele Paio' is a rare taro with shiny, green tropical foliage randomly striped and speckled in white.

Colocasia esculenta 'Waikiki' is a taro or elephant ear with stunning, shiny, variegated foliage with white and pink veins.

Colocasia 'Hilo High Colour' is a dwarf variety with variegated leaves similar to 'Hilo Beauty' but with more prominent markings.

Colocasia Pharaoh's Mask is a stunner with large bright green leaves with bulging dark burgundy purple ribs.

Conophytum maughanii is a living pebble that looks like a soft, fat, jelly-like succulent with a central cleft and shallow lobes.

Conophytum scitilum is a cute living pebble forming roundish, succulent heads with bold dark lines against a blue-grey background.

Conophytum vanzylii is a living pebble with nearly perfectly round bluish green spheres with a small cleft like red lips.

Coreopsis Permathread 'Shades of Rose' is a tickseed with varying shades of pink around yellow centres.

Cornus elliptica Empress of China is a gem of an evergreen tree with copious pointed white flowers and purple winter foliage.

Cornus kousa 'Summer Fun' is a stunning variegated dogwood with brilliant white margins.

Cornus kousa 'Snow Tower' is a compact dogwood with masses of single white flowers and striking fall colour.

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

Crassula platyphylla 'Burgundy' forms cute little branching "trees" with broad green and burgundy leaves with pointed tips.

Crassula radicans 'Small Red Carpet' is a multi-stemmed, low-growing succulent covered with small, dark-green leaves with red margins.

Crassula 'Ivory Pagoda ' is a small, upright, crassula/succulent with over-lapping, silver leaves and white flowers.