Most standard types of clematis suffer in our southern heat. I have seen some doing well in areas where their tops got some sun or at least dappled shade, and their roots were in a shady area with a good mulch to help keep them cool. They want to be moist but not soggy-wet, and they will benefit from some compost added to their soil prior to planting.
A type of clematis that is different in appearance but well adapted to the south is the Sweet Autumn Clematis (Clematis dioscorifolia). It produces billows of tiny, creamy-white blooms in late summer/fall.
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