Dmj, it's allium drummondii http://davesgarden.com/guides/pf/go/55460/ I think.
LouC, a "blackberry winter" is a brief cold spell during the time that blackberries are in bloom. It's usually around late April, or early may. An old-timer said to me last year that when it was snowing on April 20th "looks like a blackberry winter". I had to look it up.
Show what is still green after the frost
