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

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

Cyrtanthus obliquus is a highly desirable South African bulb with pendulous, tubular flowers in fiery red, yellow, and green.

Cyrtanthus spiralis is a highly desirable South African bulb with twisted, corkscrew, green to blue-green leaves.

Cytisus x boskoopii 'Boskoop Ruby' is a sterile broom with sprays of fragrant, ruby-red, pea-like flowers.

Cytisus x boskoopii 'White Lion' is a sterile broom with sprays of fragrant, pure white, pea-like flowers.

Cytisus x boskoopii 'Zeelandia' is a sterile broom with fragrant pink, peach, yellow, and white, pea-like flowers.

Dahlia imperialis is the giant "tree dahlia" that reaches 10-20 feet tall with late late lavender blooms 3-4 inches wide.

Dahlia imperialis 'Alba' is the white form of the giant "tree dahlia" that reaches 10-20 feet tall with single white flowers.

Dahlia 'Alfred Grille' is amongst the most dramatic of cactus-flowered dahlias with samon pink and yellow bicolour flowers.

Dahlia Anemone 'Blue Bayou' has lavender-blue outer petals and a central cushion of darker burgundy petals on tall dark stems.

'Boogie Woogie' is a large-blooming anemone-type Dahlia with a canary yellow centre and white and fuschia-pink streaked petals.

Dahlia 'Bishop of Auckland' has rich deep red single flowers from June until frost over burgundy foliage.

Dahlia 'Bishop of Canterbury' has rich magenta-red flowers from June until frost over burgundy foliage.

Dahlia 'Bishop of Dover' has a peony type, white flower highlighted with pink and lavender.

Dahlia 'Bishop of Leicester' has lavender single flowers highlighted with pink atop rich, burgundy foliage.

'Bishop of Llandaff' is the most popular of all burgundy-leaved Dahlias with red flowers from June until frost.

Dahlia 'Bishop of Oxford' has cheerful orange flowers from June to frost above burgundy foliage.

Dahlia 'Bishop of York' has bright yellow flowers from June to frost over burgundy foliage.

Dahlegria Tricolore is a stunning single dahlia with glowing tones of pink, coral, red, and yellow all atop burgundy foliage.

From the Dark Angel series, Dahlia 'American Pie' has lavender pink flowers with white edges over burgundy foliage.

From the Dark Angel series, Dahlia 'Braveheart' has bold magenta-purple flowers over burgundy foliage.

From the Dark Angel series, Dahlia 'Dracula' has rich red flowers over burgundy foliage.