How to Build a Durable Cedar Raised Garden Bed

Cedar is the gold standard for raised garden beds because it naturally resists rot and insects without the need for toxic chemical treatments. A well-built bed keeps your soil fluffy, prevents compaction from foot traffic, and allows you to manage drainage and soil quality far better than planting directly into the ground. Done well, your garden bed should sit level on the earth and be reinforced at the corners to withstand the outward pressure of the soil. Aim for a height of at least 12 inches to allow deep root growth for vegetables and flowers alike, and ensure your site gets at least six hours of direct sunlight each day.

1. Measure and cut boards straight. Measure and cut your cedar boards to your desired length and width using a circular saw. For a standard 4x8 foot bed, cut two 8-foot boards for the sides and two 4-foot boards for the ends.
2. Lock in the corners. Cut a 4x4 cedar post into four 12-inch lengths. Use exterior-grade deck screws to attach the side and end boards to these internal corner posts.
3. Set a perfectly flat foundation. Clear away grass and weeds in the desired area. Place the assembled frame on the ground and use a long level to ensure the structure sits evenly on all four sides.
4. Block weeds before soil. Lay down a piece of heavy-duty landscape fabric or a layer of thick cardboard inside the bed covering the bare ground. This smothers existing weeds while still allowing water to drain.
5. Fill with nutrient-rich blend. Fill the bed with a blend of 60% topsoil, 30% compost, and 10% peat moss or coconut coir. Mound the soil slightly higher toward the center to allow for natural settling.
6. Inspect and finish strong. Check all corners for stability and ensure no screws are protruding. Run your hand along the top edges to verify there are no splinters that could cause injury during gardening.