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This beautiful European sea holly forms clumps of heart-shaped leaves, over which a profusion of anodised, blue thimbles appear on vibrant stems. Tolerant of the toughest conditions, `Blue Sea Holly' may require staking in rich soils. This spiky character adds interest to our border and looks wonderful planted amongst agastache and coneflowers. Also a superb cut flower, much beloved by florists.

This slideshow of botanical images demonstrates garden color combinations based on color theory, diverse species and bloom time.

Hazel Sillver picks her favourite billowy plants to give the garden a beautiful hazy tapestry

Garden design, gardens and planting design.

Echinacea purpurea 'White Swan' growing with Geranium 'Rozanne' and Eryngium p... Image:0308016 - Stock photo from GAP Gardens, garden & plant photography

Eryngium planum, KKSgb2950/22

Posts about MIxed hedging written by David Marsden

Sea Holly (Eryngium) is a great carrot relative with metallic violet-blue flowers that pollinators love. Coneflowers (Echinacea) not only pair well with them, but draw more pollinators and seed-seeking goldfinches in the fall. Longwood Gardens, PA

An extravagant display of blooms isn’t the overwhelming impression the garden is making this July, which is pretty typical. Though the Pennisetum ‘Skyrocket’ grasses are technical…

Sedum Xenox

Aster ‘Marina Wolkonsky’, Eryngium planum ‘Blaukappe’ and Pennisetum ‘Karley Rose’

The Royal Horticultural Society is pleased to offer high quality prints and canvases from its unique image collections. Images are available in a range of sizes and frames, delivered directly to your door. Featuring botanical illustrations by artists such as William Hooker, Georg Ehret, Claude Aubriet and Lillian Snelling as well as contemporary photography of plants and flowers.