|Their tall, striking foliage and thistlelike clusters of flowers make them a favorite border or rock garden plant. Many are drought-tolerant. The summer-blooming, soft blossoms harden in prickly, long-lasting cut and dried flowers. Tops of flower spikes bloom first, while flowers on lower, side-branching stems bloom later. The blue flowers have thimblelike domes surrounded by steel-blue, petallike leaves. Need full sun and good drainage. Start by root cuttings, as they do not like transplanting, or by seed. Space plants about 1 foot apart.
One of the showiest Sea Hollies, its stout blue stems hold large, steel-blue flowers and bluish, leathery, toothed leaves.
Attributes - Eryngium alpinum 'Superbum'
Plant Type: Perennial
Bloom Season: Early Summer through Mid Summer
Flower Color: Blue, Purple
Height: 2 ft. to 3 ft.
Width: 1 ft. 6 in.
Sunlight: Full Sun
Climate: Zones 4, 5, 6, 7, 8, 9
Notes: Thrives in Alkaline Soil, Dry Climates. Cut Flowers, Drought Tolerant, Long Blooming.