The Best Closed Bottom Raised Garden Bed Ideas. Line the bottom of the garden bed with cardboard or weed mat to prevent grass or weeds growing through. Web showing results for raised garden bed with closed bottom 15,975 results sort by recommended sale outdoor raised garden bed by frame it all $83.00 ( 19) fast delivery free shipping get it by thu.

You can fill the bottom of a raised garden bed with a number of organic materials, including straw, grass clippings, wood chips, and leaves. As mentioned, a raised bed is a box with no bottom or top—a frame. Web tiered timber raised garden bed.