Good Morning!
Boy are you lucky you found one of those! I have a small one that had one magnificent flower that I enjoyed daily until its time to fade and drop.  Unfortunately they are not hardy anywhere in Ohio and will winter kill even in the best of protected places.
I have a good number of tropical hibiscus that I bring in over the winter.  They are not easy keepers in the winter and will get aphids so fast it will make your head spin, but I find it worthwhile to keep them.
I found this article on this beauty and have attached it below:

https://gardens.si.edu/learn/educational-resources/plant-care-sheets/care-of-hibiscus-rosa-sinensis/#:~:text=Hibiscus%20are%20carefree%20but%20do,encourage%20stronger%20and%20more%20blooms.

and an article on overwintering:
https://extension.umd.edu/resource/overwintering-tropical-plants/

Best of luck to you and thanks for using Ask a Master Gardener.
Enjoy the blooms this summer!

Leslie 
EMG