This is a great way to utilize all those clay pots we gardeners sometime collect over the years. Having all the plants in one place saves time and water.
Also, don't limit yourself to just clay pots, you can use any relatively round object that has a hole in the bottom. I also made a neat version out of old tea kettles, which you can view on the website link I gave above.
Step 1: Step 1 - Prepare the site
Note: Depending on the height of the pots you have chosen, you may need to lengthen or shorten the piece of rebar. I would suggest you measure the height of all the pots ahead of time and then add 24" to that total before cutting your rebar.