The Ixora subject has not been popular in plant discussion for some reason. The same with pruning and caring for this delightful plant. Congratulations on successfully keeping it thought the winter indoors which is sometimes troublesome for some gardeners in a cooler climate zone.

I personally have found Ixora keeps well compact on it's own and calls for little pruning to be done. Unless of course, it has grown leggie do to lack of light and over fertilizing during wintering indoors.

Once the weather permits I would suggest bringing it outdoors and allow it to acclimate to it's new shady location. It is best to let the plant go into it's blooming cycle then prune after it's done flowering.

Yes, don't be surprised when I say you can keep the plant beautifully thriving with out any fertilizer at all with as little effort as you would spend on fertilizing your plant. I am a firm believer in natural methods and have been cultivating this way for many-many years.