Thanks for the info... But now I'm going to be cautious about letting my chickens go at 'em; I'd rather have them as soil cleaners than chicken food.
David Wechsler commented on a link
Another reason for urban gardening is to help clean toxic wastes that have accumulated in the soils there.
When I started clearing the weeds in my overgrown garden beds when I first bought my house, we found all sorts of treasures like car parts, wires, old glass - and it got me thinking "how clean is this soil?"
So, I think people need to develop an awareness that your land may have been industrial at some time (or perhaps there was a shed with chemicals there at some point), etc...
Beyond that, I would like to suggest that people consider approaches for DIY bioremediation.
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