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http://tlc.howstuffworks.com/home/cure-toxic-yard.htm
Best Plants For The Job
- Cabbage and other crucifers — Heavy metals like lead

- Indian Mustard Greens — Heavy metals like lead, Arsenic, radiation

- Alpine Pennycress — Heavy metals like lead

- Geranium — Heavy metals like lead

- Sunflowers — Heavy metals like lead, radiation

- Dandelions — Heavy metals like lead

- Pigweeds—Radiation

- Alfalfa—Benzene, petroleum

- Ferns—Arsenic

- Clover—Petroleum

After one to two full seasons of these plants, continue to test your soil to make sure toxins have been removed before letting the little ones dig in. And most importantly, make sure not to throw the discarded plants into the garbage where they end up leaching chemicals back into the soil through landfills. You need to treat these plants as toxic waste and dispose of them through your local government's hazardous waste program.

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