I have some edging with white rock over landscaping fabric around parts of the house. I am starting to work on the backyard now for this. There are two sections where I don't want rock about 24" x 55", so I cut white tarp and the plan is/was to put that down with garden staples like you would with the fabric and then not cover those areas with rock. Then it dawned on me... the fabric breathes, the white poly tarp does not. Does anyone know if that's fine? I am wondering if those areas under the sections of tarp would get nasty with mold, etc. after a little while. I'll hold off until I know!