That is the hardest thing to do. My garden is all jam packed. One of the dumbest things I did was plant a monterey cypress 4 feet from my house. It was really cute for the first couple years. I had to work all day to dig it up and move it, it was so huge in just 3 years. And I did know better, I really cannot understand why I did it. So if that did not make me stop, what will?