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.

Yucca rigida is a dramatic, trunk-forming, hardy species with a crown of stiff, sword-like, powder blue leaves.

Yucca rostrata has a beautiful, spherical powder blue crowns. It will develop a trunk and form an upright, unbranched tree.

'Sapphire Skies' is a super hardy Yucca rostrata with domes of excellent baby blue foliage.

Zantedeschia 'African Gold' has deep green foliage with striking gold veins and big pure white calla lily flowers.

Zantedeschia aethiopica 'Green Goddess' has white calla lily flowers with their tips dipped in rich green.

'White Giant' is a fantastic, steroidal selection of Zantedeschia with 5 foot high foliage and 7 foot tall flower stems with huge white flowers.

Zantedeschia aethiopica 'White Giant' (South Africa) is a large grower with all green leaves and large, white flowers.

Zantedeschia 'Albomaculata' is a spotted calla lily with ivory-white trumpet-shaped flowers.

Zantedeschia 'Black Forest' is a spotted calla lily with sultry purple-black trumpet-shaped flowers.

Zantedeschia 'Captain Lido' has yellow and orangy-pink, trumpet-shaped flowers above bright green leaves with white spots.

Zantedeschia 'Creme/Cream' is a spotted calla lily with creamy white and green flowers.

Zantedeschia 'Flame' is a spotted calla lily that displays bi-colours of yellow and orange-red.

Zantedeschia 'Garnet Glow' is a spotted calla lily with rosy-pink, trumpet-shaped flowers.

Zantedeschia 'Kiwi Blush' is subtle yet stunning with white spathes with pink bases.

Zantedeschia 'Majestic Red' displays dark red trumpet-shaped flowers with black bases.

Zantedeschia 'Millenium Gold' is a spotted calla lily with bright yellow trumpet-shaped flowers with green bases.

Zantedeschia 'Nashville' has yellow and magenta, trumpet-shaped flowers above bright green leaves with white spots.

Zantedeschia 'Pasja' is a calla lily with flowers that open purple and lighten towards shades of pink.

Zephyranthes candida or white rain lily is an amaryllis relative with icy white, star-like flowers centred with yellow.

Zephyranthes carinata or pink rain lily is an amaryllis relative with beautiful pink flowers centred with yellow.