Pallet turned on its end with the blocks used as fixing points for slats from another pallet screwed to them to form the planting troughs on the top and middle sections. The larger, deeper trough at the bottom is approx. 12 inches deep again formed from using slats from another pallet. Clear polythene has been stapled to the inside faces of the planting troughs with holes made for drainage. The whole thing has been coated with a green fence stain.