Buddleja Davidii. Long, curved panicles of small, purple or lilac flowers against blue sky. Flowers are open at end, finishing and browning as they extend towards stem.

African tuliptree, Spathodea campanulata. View from below looking up at flower clusters against blue sky.

Sea lavender, Limonium sinuatum. Close cropped view of flower head with clustered, small purple, blue flowers.

Sea lavender, Limonium sinuatum. Close cropped view of flower head with clustered, small purple, blue flowers.

Iris japonica. Two pale blue flowers with ruffled frill to petals and an orange crest on each fall.

Hibiscus flower with protruding pistil and stamens, turned upwards towards sunshine against blue sky.

Coneflower, Black-eyed Susan, Rudbeckia flowers with bright yellow petals surrounding central cone against blue sky.

Blue, funnel-shaped, pendent flowers of Virginia Bluebell, Mertensia virginica with water droplets on petals.

Flower spikes of lavender, Lavandula angustifolia Blue Cushion.

Sea holly, Eryngium zabelii Big Blue, Close view of thistle-like flower head surrounded by silvery blue bracts.

Sea holly, Eryngium zabelii Big Blue, Close view of thistle-like flower head surrounded by silvery blue bracts.

Sea holly, Eryngium x zabelii Jos Eijking. Thistle-like flower heads surrounded by spiny, silvery blue bracts.