We grow the long forsaken perennial herb Good King Henry for early spring greens. This plant will self sow if allowed and is an excellent substitute for spinach. We sometimes adorn homemade pizzas with it, the young spring leaves are especially good. Once the seed heads appear it does become somewhat bitter but is then a real treat for our chickens. Some call it Fat-hen, as it was supposedly used in Germany to fatten poultry in days long past.
I love perennials that need only to be planted once and can then be enjoyed for many years to come. Three cheers for the king.