An easy DIY raised garden. I made 2 of these: one with my wife for our yard, and a 2nd one with my Dad for his yard. Each one only took half a day to build. Filling it with dirt is another story.

We used weather treated wood. The sides of the box are made from three 12 foot pieces of 2x12. One is cut in half for the short sides of the box. The top rails are are made from three 12 foot pieces of 2x6. I used 5" lag screws with washers to attach the top rails to the sides: 5 on each of the long sides, 3 on each of the short sides.. I used 2 lag screws on the outside of each corner, plus an angle bracket on the inside for extra support.

Cutting the top rail to a point at each end allowed us to keep the long edge at its full 12' length. The top rail overhangs more on the outside of the box than the inside.

The seat rolls along the top rail to make planting and harvesting easier. The top of the seat is made from 2x10 and the sides are 2x4.