Why won't my mock orange shrubs flower? What can I do to encourage flowering next spring?

I have three shrubs that are growing profusely. They are grouped together and are about 3 years old. They didn't flower at all for the first two years, and this year there were only a handful of flowers on one of the shrubs. They should be covered with fragrant flowers. Can't figure out what's the problem.

Why won't my mock orange shrubs flower? What can I do to encourage flowering next spring?
First, make sure it is not a dwarf mock orange. These will not bloom. If it is growing as profusely as you say, then it is a little too happy. What I mean by this is that you may have put on too much nitrogen fertilizer or that it has been supplied naturally by late spring rains, especially if it has not rained in a while. On a bag of fertilizer, there are three numbers separated by dashes like this: 12-6-6. The first number indicates the amount of nitrogen by percentage in the mix, the next is phosphorus, and the last is potassium. You only want to put fertilizers with nitrogen on spring blooming plants up until the beginning of fall. After that only us fertilizers with either low or no nitrogen.
Reply:Try using miricle grow fitilizer stackes for friut trees early fall and again in early spring, also make sure they get (deep) watering I water mine in the summer all night every other week and in the winter once a month depending on the rain! Good luck!
Reply:put fertilizer on it and see what happens
Reply:If it is a Mock tree it is not real so you wouldn't get any more flowers.