Jacqueline van der Kloet at the Perennial Plant Conference at Swarthmore this past fall. I like the idea because the permanent plantings are not early season plants and this will be a fun colorful opening act.
I anticipate, based on many years experience, not problem with planting at this late date. I've done it many times both in my own garden and for other people. Possibly if we were farther north and the ground was going to freeze solid there could be problems, but we aren't and there won't be.