late blooming perennial

I'm soliciting suggestions.  I'm giving up trying the get the late blooming
monkshood I have to perform for me.  The idea was to have it bloom in fall
in front of a spicebush with its yellow fall color, but after three years,
I'm going to move it and give it one more chance elsewhere.  I do have very
difficult, droughty soil that has its own ideas about what it will grow.
(No Heuchera does well for me, or any monkshood except a big one with very
lax stems that was given to me and is in full bloom now in the unimproved
soil. Cimicifugas--the native Black Cohosh--still won't bloom, and Liatris
spicata also grows very peculiarly, though L. squarrosa does magnificently.
Weird, I know.  Biggest gardening challenge I ever had is this place.) Is
there any late aster that has a deep purple or blue color, can tolerate
pretty dry conditions as well as partial shade, and is at least 3 feet tall?
(I do have asters in other areas that are doing very well.)  I have
considered trying an Amorpha canescens in place of the monkshood (I know,
it's not a perennial, but thought it might thrive there.)  I'm open to any
suggestions.  Thanks.

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