Gardman Shaped Coco Trough Liner 36"LKeep your planter troughs looking great every year with the Gardman Shaped Coco Trough Liner. This formed liner fits inside any 36" long wall trough. Simply remove all the potting soil and plants from your trough, remove the old liner, replace it with the new liner, and add the soil and plants back to the planter. Your wall trough will look better than ever. Extend the life of your trough planters with a new Shaped Coco Trough Liner.