I have a 12 foot tall cedar hedge that has been trimmed back two feet on one side, going as high as about 7 feet. It is now just raw wood showing. No green anywhere in that section. Will it grow back? If left for a year, will it fill in, just two feet back from where it was? The top section is untouched, the opposite side is untouched. Still has lots of green on the plant, just none in the trimmed section. So, does it need to be ripped out, or will it all come back?