My Indian Hawthorne does not bloom! I have them in the morning sun and they are over 8 years old. I live in Yorktown, VA - the plants are very healthy but just will not bloom. I had a landscaper buy them for me and I planted them. I will try giving them plant food.
Indian Hawthorne Does Not Bloom
Certified GKH Gardening Expert
I would suspect an issue with to much Nitrogen. This will cause lots of green but little to no flowering.
You can add Phosphorous in the form of Bone Meal to adjust this.
You may want to have a soil test done to take the guess work out of it.
Here are links for you that will help.