ok. i have read alot on the fabric. some use it some dont. Do i realy need it? I am doing an install in the morn and was not going to use any. There was no weeds in the spot i am do this. I had to take out a bunch of old overgrown out of date yews and instll some other plantings next to a house. Ill post some pics when i am done. Anyway. do i need to do the fabric?