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.

Crinum x powellii is an amaryllis relative with strap-like foliage and pink flowers at the height of summer.

Crinum x powellii 'Album' is an amaryllis relative with strap-like foliage and white flowers at the height of summer.

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

Crinum 'Sangria' displays glossy, textured, dark purple, tropical looking foliage is topped in summer with 18 inch spikes of rosy pink, amaryllis-like flowers.

Crinum 'Stars and Stripes' has tropical-looking, lily-like, white flowers with well-defined raspberry stripes down the centre of each petal.

Cuphea 'Hummingbird's Lunch' has masses of red and yellow tubular flowers popular with hummingbirds.

Cuphea 'Vermillionaire' is a low-mounding, tender, evergreen perennial with tubular, orange and yellow flowers popular with hummingbirds.

Curcuma 'Indian Surprise' is a spectacular flowering ginger with lush, banana like foliage and pink, white and yellow flowers.

Curcuma longa, or turmeric, is the bright orange spice integral to South Asian & Middle Eastern cuisines.

Curcuma roscoeana is a spectacular orange flowering ginger with lush, banana like foliage.

Curcuma 'Bicolour Wonder' is a spectacular ginger with long-lasting white, pink, and yellow flowers and tropical foliage like a banana.

Curcuma 'Pink Wonder' is a spectacular ginger with long-lasting white and lavender-pink flowers and tropical foliage like a banana.

Curcuma 'White Wonder' is a spectacular ginger with long-lasting, white, green and yellow flowers and tropical foliage like a banana.

Cylindropuntia acanthocarpa 'Hi Ho Silver' is a spectacular selection of the buckhorn tree cholla with glistening, silver-white spines.

Cylindropuntia (syn. Opuntia) echinocarpa 'Portal Blonde' has yellow spines aging to cream and greenish yellow flowers.

Cylindropuntia imbricata is an extremely hardy and ornamental cholla cactus forming small, branched trees.

Cylindropuntia imbricata is an extremely hardy and ornamental cholla cactus from the US and Mexico forming small, branched trees.

Cylindropuntia (Opuntia) spinosior is an extremely hardy and ornamental cholla cactus from the US and Mexico that can reach 5-8 feet tall!

Cylindropuntia (syn. Opuntia) 'Golden Lion' is a natural hybrid cholla covered in golden spines with pea green flowers.

Cyrtanthus angustifolius, or stream firelily, offers curved and nodding bright red to orange fragrant trumpets.

Cyrtanthus mackenii 'Cream White' is a sweetly fragrant creamy white amaryllis relative - a great pot plant for summer patio & winter windowsill.

Cyrtanthus mackenii 'Himalayan Pink' is a sweetly fragrant pink amaryllis relative makes a great pot plant for the summer patio & winter windowsill.

Cyrtanthus mackenii 'Himalayan Red' is a sweetly fragrant red amaryllis relative makes a great pot plant for the summer patio and winter windowsill.