I have this two year old hibiscus in a pot and I put it indoor last winter with great flowers all winter long. This year I took it out in the summer and nothing since and it didn't seem to like the outdoors any longer

So I put it back indoors now and still nothing although it seems fairly alive y but nothing in terms of sprouts , only leaves.
Thanks in advance if anyone is experienced with hibiscus' , should I fertilize ?
Here's a pic
[url=https://www.flickr.com/photos/63269976@N00/6062839775/][img]https://farm7.static.flickr.com/6202/6062839775_9247e807cf.jpg[/img][/url]
[url=https://www.flickr.com/photos/63269976@N00/6062839775/]IMG-20110820-00010[/url] by [url=https://www.flickr.com/people/63269976@N00/]johnnyriv[/url], on Flickr