Eryngium 'Miss Marble' is a striking architectural hardy perennial with green foliage which is marbled with silver. Blue and silver spiky flowers rise above during the summer. 

It's often used for cut flower displays and it adds winter interest to borders if the flower spikes are left on. The birds love the seeds too.

Eryngiums make a striking addition to dry, sunny borders and gravel gardens. They have thistle-like flowers, made up of tiny flowers packed together in a tight cluster, surrounded by a ruff of spiny bracts. They are very drought-tolerant when established and require little ongoing care.