ditto! The flowering plants really seem to need natural sunlight. You could always buy two plants and rotate them in and out or the sun and back and forth into your enclosure but that might be a pain in the butt to do!
the hibiscus that I have in my chams enclosure is doing fairly good. I brought it in from outdoors approx 2 months ago, it lost some leaves near the bottom but has new growth at the top and has about 5 new buds/flowers blooming. I have a exo terra hood with two 26 watt 6500k cfls for the plants and it seems to really help (at least at the top of the plant anyways) but I think I will still swap it out once next spring comes along to get it thriving again. I water it approx once every three days or so.