Weigela 'Electric Love' is a dwarf ornamental shrub with tubular, red flowers and dark foliage.

Weigela 'Tuxedo' is a mid-sized ornamental shrub with fragrant, funnel-shaped, white flowers and dark foliage.

Wisteria frutescens 'Amethyst Falls' is a daintier, better behaved version of the Chinese wisteria for small spaces.

'Blue Moon' is an extremely fast growing and super hardy Wisteria for zone 3(!) that blooms up to three times a year.

Gordonia grandiflora is a remarkable semi-evergreen tree with lancolate leaves and fragrant, camellia-like flowers.

Yucca aloifolia "Magenta Magic" has evergreen stalks of deep green that deepen to purple mauve.

Yucca 'Bronze Age' is a blue-green yucca that has deep burgundy bronze colouration in fall and winter.

Yucca filamentosa 'Excalibur' forms rosettes of spiky, strap-like leaves coloured blue-green to powdery blue.

Yucca filamentosa 'Hofer's Blue' forms rosettes of spiky, strap-like leaves coloured in a bold silver-blue.

Zanthoxylum piperitum, the Japanese pepper, is an aromatic, spiny shrub with small, yellowish green flowers and scarlet fruits used in Japanese and Korean cooking.

Zanthoxylum simulans, the Sichuan pepper, produces brownish red fruits that have a spicy, numbing effect.

Zanthoxylum simulans, the Sichuan pepper, produces brownish red fruits that have a spicy, numbing effect.

Zinnia grandiflora 'Gold on Blue' is hardy to zone 4 with fine, textured, bluish-green foliage topped with golden yellow flowers all summer.