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hello Gem, I have been growing a Black Eyed Susie for years and if you mean Thunbergia, I'm afraid they don't last through the winter and get a bit straggly at the end of the season. I believe there is a perennial type so perhaps you have that variety. They would always be frost tender whichever one you are growing so maybe a tidying up of the plant would be the most you could do for it but don't build your hopes up!
Try and collect some seed so you can grow it next year
This is perennial but tender. If you can protect it from cold it will survive
According to my RHS book there are annuals and perennials nut, sorry to argue!
I'm sure your right dd.
I was thinking of Thunbergia alata, known as Black Eyed Susan, a tender perennial climber, grown as an annual in our climate. They last for years if you protect them in winter.