hiya

i ve 2 color of hisbiscus flowers at home.i use fertilize it n lo it got bloom..so it need regular fertilizer.hope it ll help.find good one in market like fertilizer all fruits n flowers

Hibiscus are heavy feeders, I believe. Death at 32F so have to be potted and bring indoors if you want em around.  I use Osmocote 8 to 9 mo (how long is lasts) slow release which is about 18-6-12 NPK.  This product looks like little round pellets (coated with a precisely permeable membrane) and can be left on pot surface or scratched into top of soil.  The membrane releases at 70F.

Keep your Hibiscus inside in full sun for rest of this winter and try the 4 to 6 mo Osmocote mentioned below to take advantage of slow release at 70F.  Lots of foliage (vegetative) without blooms (fruit) usually indicates too much N (nitrogen).  P (phosphorus) and K (potassium) promote blooms/fruit.  Usually when fertilizer discussions refer to "balanced blend" they mean equal numbers of NPK; as 20-20-20 which really blasts a lawn to lushness.

By the way Osmocote also comes in a 4 to 6 month version which is 14-14-14 NPK.