I have a church that needs more parking lot space. They want me to get rid of a lot of gardens to make more space. Most of the plants are viburnum and Indian Hawthorn (in pretty rough shape), I was thinking of having 2 guys with brush cutters cut off the top of the plant, then hit the area a couple times with some roundup pro. Then come back later and sod/seed. Do you think this would work out?