Build a sturdy 4x4 foot raised garden bed perfect for vegetables, herbs, or flowers. This beginner-friendly woodworking project takes about 2-3 hours and requires basic tools. Cedar's natural rot resistance makes it ideal for outdoor garden use.
Collect all your cedar boards, hardware, and tools. Choose a flat outdoor workspace with good ventilation for cutting and assembling. Lay out a drop cloth or work on grass to protect surfaces.
Using your measuring tape and pencil, mark the four 8-foot cedar boards into eight 4-foot lengths (four for long sides, four for short sides). Double-check each measurement before cutting. Mark clearly on the face of each board.
Using your circular saw or hand saw, carefully cut along your marked lines to create eight 4-foot pieces. Wear safety glasses and work gloves. Keep cuts straight and perpendicular to the board edges for clean corners later.
Use 80-grit sandpaper to smooth any rough cut edges and splinters on all eight boards. Pay special attention to the cut ends. This prevents splinters during assembly and creates a finished look.
Arrange four of your 4-foot boards in a square on the ground. Position them so each board's end sits flush against the face of the adjacent board (forming butt joints at corners). This creates your bottom layer.
At each corner, use your drill and 1/8-inch bit to pre-drill two pilot holes through the face of one board into the end of the adjacent board. Space holes about 1 inch from top and bottom edges, centered on the board thickness. This prevents splitting.
Drive one 3-inch exterior wood screw through each pre-drilled hole using your drill. Keep corners square by checking with a carpenter's square as you work. Tighten screws firmly but don't over-tighten and strip the wood.
For extra corner strength, attach one metal corner bracket on the inside of each corner using 1-inch screws. Position brackets flush with the top edge of the boards. This step is optional but recommended for durability.
Place your remaining four boards on top of the first layer, offsetting the corner joints so each new board spans across the joint below (like bricks). This creates a stronger interlocking structure. Check alignment carefully.
Repeat the pre-drilling process for the second layer corners, then drive 3-inch screws through the pilot holes. Additionally, drive screws down through the second layer into the first layer at each corner for vertical stability (two screws per corner, angled slightly).
Along the middle of each 4-foot side, drill pilot holes and drive 3-inch screws down through the top layer into the bottom layer. Space these every 18-24 inches. This prevents boards from bowing outward under soil pressure.
Carefully move your assembled planter to its permanent garden location before filling. Choose a spot with appropriate sunlight for your plants. Ensure the ground is level, or level the ground where the planter will sit.
If desired, line the bottom of your planter with landscape fabric to prevent weeds growing up from below while allowing drainage. Cut fabric to size, drape it inside, and staple to the inner walls about 2 inches below the top edge.
Fill your planter with quality garden soil or a mix of soil, compost, and peat moss. Fill to about 2 inches below the top rim. Water thoroughly, let settle overnight, then add plants, seeds, or seedlings according to your garden plan.