Raised Beds: Purchase two boards (which are naturally rot-resistant) - cut in half making long. Cut into four pieces a length of a pine stake to nail the cedar boards to at corners. Each box costs less than ten dollars.
How to Build and Install Raised Garden Beds by Popular Mechanics Well suited to novices raised gardens allow you to customize the soil bed and maximize the use of space by setting plants closer together and increasing yield while decreasing water
Tips for Choosing the Best Wood for Raised Garden Beds