Spinach, Spinacia oleracea, Close-up detail of a green vegetable leaf in sunlight.

Nasturtium, Tropaeolum majus, Close up of green leaves showing the white veins.

Oak, Quercus robur, Acorns growing on the branches of tree in late summer.

Blackthorn, Prunus spinosa, Abundant purple sloe berries growing on a shrub in the autumn in the New Forest.

Blackthorn, Prunus spinosa, Abundant purple sloe berries growing on a shrub in the autumn in the New Forest.

Rose mallow 'Blue Bird', Hibiscus syriacus 'Oiseau Bleu', Purple blue buds opening among green leaves on a shrub.

Green Alkanet, Pentaglottis sempervirens, Top view of cluster of blue flowers with white eye atop hairy green leaves.

Palm, Fan palm, Abstract view of folds of a palm leaf creating steps or ridges.

Opium poppy, Papaver somniferum, Front view of pink flower with dark splodges held above soft focus pale blue green foliage.

Purple viper's bugloss, Echium plantagineum with pink Lathyrus tingitanus, Tangier pea, red opium poppy growing in a meadow in La Gomera in the Canary Islands.

Coleus, Solenostemon scutellarioides 'Bone Fish', Deeply cut, long slender red-pink veined leaf with lime-gold edges.

White bryony, Bryonia dioica, Close side view of one tightly curled tendril loop against dark green.