Rhododendron, Studio shot of white flowers on a stem against a pure white background.

Rhododendron, Studio shot of white flowers on a stem against a pure white background.

Cactus, Orchid cactus, Epiphyllum cultivar, Flower of the Night, Exootic white flowers against a black background.

Daisy, Double daisy, Bellis perennis, White flowers growing outdoor in a garden.

Allium, Garlic, Wild garlic, Allium ursinum, Side view of white flower growing outdoor.

Allium, Garlic, Wild garlic, Allium ursinum, Side view of white flower growing outdoor.

Allium, Garlic, Wild garlic, Allium ursinum, Side view of white flowers growing outdoor.

Allium, Garlic, Wild garlic, Allium ursinum, Side view of white flower growing outdoor.

Allium, Allium 'Mount Everest', Close up detail of white globe shaped flowerhead.

Gladiolus, Sword Lily, Studio shot of white and pale lilac flowers on a single stem.

Clematis, Studio shot of single purple flower with yellow stamen.

Geranium, Cranesbill, Studio shot of single stem showing open purple flowers and buds.