Adventures in container gardening! Part 2

Today I found out I can get a bunch of old tires from this guy on Freecycle which works out awesome since I want to stack them 4 tall and use them to plant potatoes. I'm so excited they won't take up a ton of room and I will be able to do at least 4 of them in my back yard, yay!!!!!!! Even if can't use until next year we are on our way.  http://www.kiddiegardens.com/growing_potatoes_in_tires.html