This is one of those plants that will appreciate the warmth of your summers, but is best kept in a pot so you can move it somewhere frost free for the winter. If its still alive, then cut it back to where there's growth and keep your fingers crossed, as well as giving it a feed and good water. Or dig it up and put it in a pot in good potting compost.

We have a maison secondaire in the rural limousin and the summers can get realy hot, and the winters can be incredibly cold, it was-10 in our kitchen one day last winter, lol, some of the locals have these in large pots, but protect them in polytunnels and wrap loosely with fleece.