Florida Seiboldi cannot be put in the ground in zone 6. I have mine in a large planter and I take it into my unheated garage for the winter. I bought it from Brushwoood four years ago and although it was small has survived this far and has become reasonably big. It is just beginning to leaf out and should have some flowers by June. I will post pictures some pictures then.

Yes, if you read the literature, most clematis authorities consider this to be a rather tender species:
"needs a very sheltered spot in the garden or grow in large pots or tubs in a cold greenhouse or conservatory"
"tender to a degree, this climber needs a choice warm wall but in favored areas only"
(Both of these from British authors referring to growing it in the UK, which is zone 7 and higher).
And from a more local authority, LInda Beutler: " it is slow to establish and somewhat tender. The best plants of this that I have seen are container grown indoors and rolled outside when the plant blooms."

I live in a very mild zone and have been trying florida seiboldii for years. 3 times it bit the dust - never made it through winter. Trying once more (found it at Costco last spring and too cheap to pass up) and so far, so good. But it IS in a container, so just in case of one of our rare Arctic blasts hits, I can haul it inside.

I killed it in a heated greenhouse....

Oh, thanks so much for that encouraging comment!! LOL! Good to see you back, BorS. We've missed your input recently.