My daughter bought a house a couple of years ago and in the front is a Dwarf Japanese Maple bush/tree. It is only 18 inches high but has spread out 3-4 feet wide. It has grown a lot over the last few years and it is interfering with her driveway and with cutting the grass. How do you trim it? Do you trim it like a shrub? We have know idea on how to take care of it.