Actually, this question was asked on the og list. It turns out that tires
do not release anything into the soil.
We've been growing sweet potatoes in them for 2 decades and no one's got
sick yet.
Libby
libby@igc.apc.org Libby J. Goldstein phone & fax: 215-465-8878
Philadelphia USDA zone 7A Sunset zone 32
My garden must be n-dimensional if it's out here in cyberspace.