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!
My Room!

My Room!

Sharing Some Garden Pron

Sharing Some Garden Pron

Mantel ideas

Mantel ideas

Repotting Question…

Repotting Question…

Help with plant/flower identification, please :D

Help with plant/flower identification, please :D

SPICY SAUSAGE BALLS —I CALL THEM MY MEDIEVAL SNACKS.

SPICY SAUSAGE BALLS —I CALL THEM MY MEDIEVAL SNACKS.