Cow's horn, Euphorbia grandicornis, Close up showing the spines and small yellow flowers.

Great desert spoon, Dasyliron achrotrichum, Dramatic spikey mass of silvery narrow leaves standing out against a dark background.

Silver Spear, Astelia chathamica and Wormwood, Anthemis absinthium, Silver leaved plants growing together.

Smoke bush, Cotinus coggygria, Close view of an autumn leaf with its speckled patches of colours.

Common or wild broom, Cytisus scoparius, A ripe downy seed pod on a stem is split open to reveal seeds inside.

Aloe, Aloe polyphylla, clsoe up showing pattern of spiky leaves.

Aloe, Aloe polyphylla, clsoe up showing pattern of spiky leaves.

Variegated Sword Lily, Furcraea selloa var. marginata, close up detail of leaves.

Pittosporum, Pittosporum tenuifolium 'Marjory Channon', green fliage with white edges.

Pittosporum, Pittosporum tenuifolium 'Marjory Channon', green fliage with white edges.

Smoke bush, Cotinus coggygria 'Royal Purple', masses of tiny flowers with dark purple leaves behind and contrasted against golden foliage in soft focus.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of single flower head, selective focus.