Tiering Up To create your own potting shelf, begin with salvaged wood, or purchase new planks from a home-improvement store. Use terra-cotta pots for your shelf supports. (We used large ones for extra stability. Make sure the mouth of your pots are slightly smaller than your boards.) Place two pots upside down a few inches away from each end of the board. Place the board on top of the pots. To make the second tier, stack two pots at each end of the first board, aligning them with the pots below. Add another wood plank and then more tiers as needed. Paint your boards and pots to add interest.