Cactus, Golden Barrel Cactus, Echinocactus grusonii, Detail of spiky plant showing mass of needles.-

Cactus, Golden Barrel Cactus, Echinocactus grusonii, Aerial view of spiky plant showing mass of needles.-

Houseleek, Sempervivum, Detail of yellow coloured plant showing pattern.-

Larch, Larix decidua, Cones growing on branch of tree with spiky leaves.

Larch, Larix decidua, Cones growing on branch of tree with spiky leaves.

Larch, Larix decidua, Cone growing on branch of tree with spiky leaves.

Castor Oil plant, Ricinus communis, Close up of red coloured plant showing spiky detail.-

Castor Oil plant, Ricinus communis, Close up of red coloured plant showing spiky detail.-

Pincushion Euphorbia, Euphorbia enopla, Close up showing spiky texture.

Pincushion Euphorbia, Euphorbia enopla, Close up showing spiky texture.

White Globe Thistle, Echinops bannaticus 'Star Frost' Close up showing the spiky texture.

Echinacea, Purple Coneflower, Echinacea purpurea 'Rubinglow', Close up of flowers with mauve coloured petals and spiky texture.

Sessile oak, Quercus petraea, Aerial view of many wet, fallen brown leaves and an acorn.

Sessile oak, Quercus petraea, Front view of a sprig of pale new spring leaves against pale green.

Dinosaur Back Plant, Myrtillocactus geometrizans forma cristata, Close view of spiny ribs of this unusual blue green cactus.

Dinosaur Back Plant, Myrtillocactus geometrizans forma cristata, Close view of spiny ribs of this unusual blue green cactus.

Flamingo flower, Anthurium, Front view of single pink flower showing the large central stigma against the single petal.

Lion's tail, Leonotis leonurus, Side view of tubular orange flowers in a spikey whorl encircling a square stem.

Lion's tail, Leonotis leonurus, Side view of tubular orange flowers in a spikey whorl encircling a square stem.

Common oak, Quercus robur, Side view of upper branches of some trees with ivy climbing up the trunks.

Painter's palette, Anthurium scherzerianum, Red plant pot on a table.

Banana, Musa acuminata, Two bunches with strawberries grouped between.

Palm, Sago Palm, Cyas revoluta, Close up of Female plant.

Palm, Sago Palm, Cyas revoluta, Close up of Female plant.