I have an Innocence Mockorange that is basically a "growing stick"! It just gets taller and taller (about 4 years old) but I can NOT get it to branch. I have tried to prune the center but it just grew back exactly like before - 1 stick going straight up. It has a few lanky branches . . . but the width of this bush is like 14" or so. It does get some blooms every year but not prolific.

Could I possibly have it in too much shade? Could that affect it's spreading? It is in the bottom of my yard - could too much wetness affect it?

Thank you for any help. :o)