4x4s (legs), 2x4s (frame), and 1x6 or 5/4 deck boards (planter walls and floor).
Cut four 4x4 legs. For extra stability, notch the top of the legs so the frame sits directly on the wood rather than just hanging by screws. Woodworking Plans To Build A Raised Planter Table
30" to 32" (table height) is ideal for most people to work without bending. 4x4s (legs), 2x4s (frame), and 1x6 or 5/4