Build a raised garden bed for flowers or veggies out of 2 x 4s. You will fine the free step-by-step woodworking plans at the link.
At the link you can scroll down the page to download the free plans to build a tiered raised garden bed. Just follow along with the free step-by-step instructions.
These garden planters have the best of both worlds. They are multi layered, and up off the ground. Build it using these free woodworking plans.