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Easy and rewarding perennial with starbursts of blue umbels on tall, upright stems. Excellent cut flower and dries well too. Herbaceous perennial; mature size 2-3 ft T x 1-2 ft W Minimum temperature: -20° F Photo close up by H. Zell / CC BY-SA Photo of umbel group by Андрей Корзун (Kor!An) / CC BY-SA Photo...

A blooming specimen of this sea holly is a sight to behold. Very ornamental steely-blue-purple thistle-like flowers on 2-3' stems have a pretty and spiny ruff — the floral equivalent of excitement. Eryngiums are incredibly hardy, and happily grow in hot and dry conditions. Excellent choice for coastal areas. Clumping perennial. Mature Size:...

Clumping, upright plants have exceptional, dissected, white-veined green leaves, and copious, almost iridescent, blue and white spiny star flowers — superb with burgundy Euphorbia. This is a Mediterranean plant that likes to bloom in mid to late summer and is one of the most satisfying of the Eryngiums. Mature size: 1-2...

E. alpinum cultivar 'Blue Star' has a saturated metallic blue coloration in the thistle-like flowers with an eye-catching spiny ruff. The flowers are held aloft on stiff stems reaching heights of 2-3 ft. Eryngiums are incredibly hardy, and happily grow in hot and dry conditions. Excellent choice for coastal areas. Clumping...

Huge, iridescent, steel-blue cones with spiny bracts on purple-blue stems rise 2+ feet above also spiky green foliage with white veins. Minimum temperature: -30° F

This large-leaved variety has big, silvery-green flowers surrounded by silver bracts to create an overall silver-white, ghostly impression. Striking! And the potential for contrast in the garden is limitless. Mature size: 2-4 feet T & W Minimum temperature: -10° F