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!
A few lasts for this season.

A few lasts for this season.

Blooming!

Blooming!

Plant ID & Diagnosis Questions…

Plant ID & Diagnosis Questions…

New Place!

New Place!

plant i.d.

plant i.d.

The Natives are restless!

The Natives are restless!