Every 3 - 4 years I cut my hedges back to about 2 foot tall. I spend a lot of time cutting out the Wisteria because it takes over. Twice it almost killed out my azaleas. It gets so thick in 3 years it becomes almost the only greenery and shades out the azaleas. The wisteria vines grow about 20 feet in length every 2 years. I have cut vines that were 50 feet long. The azalea blooms only last about 2 weeks. I never fertilize or water any plant in my yard except potted ones.