Lay out five planks of 72-inch 1-by-3 lumber flat on a work surface, with each plank parallel with the rest and one-half inch apart. This will mean there is 17 inches between the outer two planks.
Place two 17-inch planks of 1-by-3 lumber across all the parallel planks, 5 inches in from each end of the 72-inch planks. Place another two 17-inch planks 14 inches in from the first two.
Secure the 17-inch planks to the 72-inch planks with two 1 1/2-inch deck screws through the 17-inch planks into each of the 72-inch planks. This is the bench top.
Scribe a 12-inch diameter circle centered between each of the end 17-inch planks and the ones 14 inches further along. Use a scroll saw to cut out the circle.
Stand two ceramic planters, with a rough dimension of 20-inches tall and with around 10-inch rims, around 38 inches apart.
Fit the rims of the planters through the circles you cut out from the bench top. The 17-inch planks should be on the underside of the bench top. The bench top should sit a few inches below the rim of the planters.