Thank you very much for the ID!

Actually, i think it's a plain ol' batchelor button, centaurea dealbata. Some of them look like that. Mountain bluets are much bigger across- like 2-3" and they are hard to grow in this area- goodness knows i've tried repeatedly. If you let the batch buttons/cornflowers reseed a few generations they end up looking like this rather than the very double poms that you start with from cultivated seed. Mountain bluets also have this very distinct black edge to their scaling on the buds before they open up. The leaves are much broader and longer than the regular cornflower's, too. It's kind of like cornflower on steroids, but much more stretched out and elegant, and the centers are more pink. They do look very similar but take a look at this link, and see if the plant itself look like yours. You can see the black edge in that first shot of the flower. I'll look and see if i can find any shots of my gone wild cornflowers to compare. The ones at mordecai used to look just like yours, with the narrow foliage and small flowers, and were an annual, not perennial. Here is a link that might be useful: cent. montana

Thanks Remy...this has been driving me crazy since I too received it at the summer exchange, and now it has bloomed. Very sweet and thanks for finding and sharing this information. Ginny B.

They look like genuine English bluebells, Hyacinthus non-scripta ie not Spanish blue bells. However, leaves are fairly broad so maybe a hybrid between the two. If you do move them put them in dappled shade, not full sun. Imagine an English woodland environment in May.