Alan, my next door neighbor has two gorgeous
plants he has left in the ground in the winter for about four years. They are up against the south side of the house, pretty much full sun...so it's a nice little micro-climate. They are pretty common around here...I've seen them make huge clumps that are just breath taking when in full bloom.
I, too, have a lot of luck with "tender perennials" in my south beds such as Persian Shield, Lantana, Canna, Mexican Petunias, etc. The only "mulch" they get is the leaves that shed from a clump of River Birch in the front yard.
I think your gardening
zone is very similar to ours so you might consider leaving it in the ground with protection?

I snuck over and took a quick shot of the neighbors
plant...they probably think I'm drunk again.

It's pretty cloudy here so this isn't a very good shot.

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