Used tires in gardening?

Used tires in gardening?

Years ago, someone dumped a truckload of used tires on our land. (Rednecks are awesome!) I have an idea of using those tires as a border for a small raised garden in a corner of my yard. I plan to stack them two high, and make the tires themselves a sort of planter for tomatoes, rosemary, etc. My question is: Is this insane? Am I setting myself up for leaching chemical problems? Thanks for your input!
bird nest fern

bird nest fern

help me plan my garden!!

help me plan my garden!!

Presents

Presents

Transplanting Delays, Seedling Questions…

Transplanting Delays, Seedling Questions…

Floor Plan Help!

Floor Plan Help!

Identification

Identification