This is a great alternative to the traditional way of raising potatoes in rows and best for any confined space.
Growing potatoes in tires is enexpensive, fun for the family,and best of all helps mother earth.
.so do your part to help
Step 1: Bedrock
Potatoes don't like to get water-logged so have good drainage below the tires.
I found that a bed of rocks under the tires woorks best.