Saguaro cactus, Carnegiea gigantea, Dramatic view from below of a single stem with arms branching upwards towards a blue sky with wispy clouds, its shadow on a white wall.

Rhubarb, Rheum rhabarbarum, A small plant in front of four terracotta forcing pots beside a crumbly brick wall.

Rose, Rosa 'Grand Prix', Single stem red rose with leaves in glass vase against mottled blue wall.

Rampant climber covering a wall and a street light in Paris, France.

Verbena, Brazilian verbena, Purple top, Verbena bonariensis in front of a wall of stacked cut logs. Part of Wild in the City garden designed by Charlotte Murrell, Hampton Court flower show 2011.

Morning glory, Ipomoea purpurea, Purple flowered climber with heart shaped leaves. Climbing up a contemporary wooden trellis against a bright pink wall. 'Part of Control the Uncontrollable' garden by...

Fern, Hart's tongue fern, Asplenium scolopendrium with shuttlecock fern, Matteuccia struthiopteris and others, unfurling in spring, in a garden with natural dry stone wall.

Osteospurnum, African daisy, Osteospermum jucundum, Masses of pink tinged white flowers growing along the base of a stone wall.

Rhubarb, Rheum rhabarbarum, Several terracotta forcing pots in front of a crumbling white brick wall.

Ivy, Hedera helix.

Buddleja, Buddleja davidii, growing onm urban brick wall in London.

Golden male fern, Dryopteris affinis growing in a dry stone wall in Cornwall, UK.