Starting with a story about using plants to clean up heavy metal pollution in China -
http://www.aljazeera.com/video/asia-pacific/2014/04/chinese-battle-make-land-fertile-again-201441934226276246.html
led on to some other links with more detail such as this review -
http://www.esb.ucp.pt/sites/default/files/files/Biotecnologia/investigacao/pgcmarquesrcastro.pdf
It seems that plants can have a role in some situations, but reading between the lines, it seems that soil microbes are likely to have a more general role. But "further research is required .....
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