Can Hibiscus Be Planted In Ground And Left There During Winter?

Answer 1

The tropical hibiscus cannot tolerate a freeze, so in your climate, it is treated as an annual or brought inside for the winter.

If you wanted to grow the hardy hibiscus, which is perennial, you could leave it in the ground over winter and it will come back in late spring.

https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/outdoor-hibiscus-care.htm