Here's a great link with all the info you'll need to keep them happy this winter. Click on the "Growing Hibiscus up North..." link.
It also has lots of other info on hibiscus care in general.
Barb

Here is a link that might be useful: Hibiscus care link

Hi pfking,

Last summer was my first year of being a hib'er. I made my first purchase then. The plant did quiet well considering I didn't know anything about hib's at that time.

For the winter I placed it in a southern facing window, with very little heat in the room, (probably a little warmer here than where you are) but on the nights it got below freezing I did use heat.

It looked pretty bad by the time spring came around, but after learning about the feeding habits and moving it back outside, it has flourished. It's about 6 ft. tall now and causing problems for this winter season.

I made my second purchase this past summer and have not re potted this one yet. It's about 3 ft. tall. I may have to do some cutting back to be able to live with them until spring.

What I've learned: make sure they get plenty of sunlight, water infrequently, feed only about once a month with one half strength fertilizer.

Watch out for growth explosion in the spring when you get them moved back outside and start full feeding schedule.

I will try to post some photo's.

Best of luck to you and I can't blame you for not composting,
sandi