This is allium. They are from the onion family and are similar in cultivation. The bulbs of this variety are huge and they last forever in the garden. Some of my bulbs are over 6 years old and still blooming nicely each spring.
I have grown some where the flower, as in your picture, is a foot across! There are many sizes of these things but I only grow the big ones. When the flower dries it can be used in dried bouquets in the fall
Thanks. I thought they looked familiar. I had some blue allium growing in my landscaping when we lived in Louisiana.