This trellis looks like a supersize tic-tac-toe grid. Pots hung from S hooks fill each space. Start with 1-inch dimensional lumber cut to eight 4-foot lengths. Prime and paint pieces with exterior paint; coat with exterior polyurethane for extra protection.
S hooks don't hook over the boards easily, so slide three hooks onto three of the horizontal boards and position them before connecting the frame pieces. Lay out the grid in tic-tac-toe fashion, leaving about 3 inches of overhang on each end. From the back, screw all the overlapping joints together with two small screws (using two screws keeps the frame from shifting off square).
Fill petite buckets with plants and hang on the hooks. We painted our buckets with bands of bright colors.