I made a modular concrete raised garden bed out of Quikrete 5000. I started by using my X-carve pro by inventables to cut 3/4" MDF into pieces that can be stacked to create a full size prototype.

Precast concrete flower bed edging stones are easy to install. Lay out the shape of the bed with a rope or garden hose, then use a flat-blade spade to make a trench. Cut into the ground along one ...