i started my stacks off to the side of my mowed yard area in the winter and now one of the rows of pallets is overgrowing with brush. these pallets are largely empty right now, so it won't be a big deal to move them but i don't want to move them, then stack my wood just to have the brush and vines grow through the stack. i can see that being a real PITA down the line. i'm assuming the fact that the wood stacks will cut off a lot of the sunlight will keep the brush down, but i was thinking, just to make sure, i would lay down come kind of tarp or landscaping cloth to suffocate anything that wants to grow there. i'd prefer to not use weed killer or do any weedwacking. anyone ever do this and have recommendations? thanks!