Some clematis are susceptible to a bacterial wilt disease, but sweet autumn is not typically affected. I would suspect this has something to do with drainage – clematis have really strange, very fleshy roots, much different than almost any other plant, and are very susceptible to root rot. Is it possible that at some point, that ceramic pot the plastic container is in filled with water? If that happened even for a short time, it could cause fatal root rot. It’s also important to make sure its crown is not buried in soil. That said, all clematis roots are very sensitive to heat and light, so they should be mulched with shredded bark or even a layer of rocks – the old adage for success with all clematis is “Feet in the shade, head in the sun.”
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