I have gotten some online information about winterizing an hibiscus bush. I think the website is centered in Texas. I wondered if anyone has advice for...I have gotten some online information about winterizing an hibiscus bush. I think the website is centered in Texas. I wondered if anyone has advice for winterizing hibiscus in Pennsylvania, which I believe is zone 7. I know that I need to bring it indoors, right now it seems pot bound. How much of its roots can I cut off without damaging the plant? Show more