In the city, gardeners are very creative when it comes to what to grow every year especially the city has very little land to till. So, a high-raised beds were invented. Some folks will raise the beds as high as their waist for ease. Most garden centers sell the materials easy to install with your choice of oak or cedar wood.
I am unsure about these planters. Are they garden plots or cemetery plot?
One thing though, make sure your planter box is high enough to bury any forensic evidence that no CSI team can find the body.
WHAT ON EARTH ! ???