Rhododendron, Rhododendron pachysanthum 'crosswater', Close up showing green flower bud.

Flame vine, Pyrostegia venusta, Dramatic close up of the orange tubular flowers.

Flame vine, Pyrostegia venusta, Dramatic close up of the orange tubular flowers.

Flame vine, Pyrostegia venusta, Dramatic close up of the orange tubular flowers.

Flame vine, Pyrostegia venusta, Dramatic close up of the orange tubular flowers.

Phlox, Meadow phlox, Phlox maculata 'Natascha', Close view of the pink and white striped flower.

Phlox, Phlox paniculata 'miss pepper', Close up showing pink flower cluster.

Feathertop, Pennisetum villosum, Close up showing spiky detail.

Feathertop, Pennisetum villosum, Close up showing spiky detail.

Cactus, Mexican Giant Cardon, Pachycereus pringlei, Close up blue duotone colour.

Cactus, Mexican fence post cactus, Pachycereus Marginatus viewed from below against a blue sky with wispy clouds.

Orchid, Close up of white flowers with pink centres.

Dog rose, Rosa canina, Overhead view of clusters of rosehips with leaves with more soft focus behind, scattered on a white background.

Lemon, Citrus limon, Overhead view of lemons on stalks with leaves, with more soft focus behind on a white background.

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.

Honeysuckle, Lonicera periclymenum, Clusters of red berries on long stems climbing amid other foliage.

Larch, Larix decidua, Twigs with whorls of needles and small green cones.

Himalayan balsam, Impatiens glandulifera, Side view of a flowering stem among others.

Himalayan balsam, Impatiens glandulifera, Side view of a flowering stem among others.

Himalayan balsam, Impatiens glandulifera, Side view of a flowering stem among others.

Spear thistle. Cirsium vulgare, Close view of single spiky flowering head with bud and leaves.

Mexican pinenut, Pinus cembroides, Masses of pine nuts in a pile with moody light.