The lovely Eryngium eburneum in our front garden is absolutely stunning this year. It was planted in very poor soil but with excellent drainage about 17 or 18 years ago and has survived and thrived on everything the English climate has thrown at it. Usually evergreen (not in the minus 14C winter of 2010-11) all the care it requires is to have the brown leaves and flower stems pulled out in early spring. We propagate by saved seed sown in spring.
Under the large rosettes of spiny leaves is a safe, snug home for our resident hedgehog.