My shrub grows very well but it never get flowers on it. We bought our house a few years ago and they were already here. The shrub gets about 5 foot tall and wild looking. They are in the front by the walkway, so I need to trim them so they don't get in the way. Do I need to move them to a different location, although I think they like where they are? Just would love the flowers to grow. There are 3 plants about 5 ft. apart. Thank you.