(sdpb.org)
Again with class stuff. On our field trip with my Environmental Biology class to the land fill, our guide pointed out some trees bordering the property and said they were Cottonwood trees, which absorb toxins from the ground. Once the trees have reached capacity for the toxins, the land fill cuts them down and uses them like they would any other wood. Awesome.
Other plants known to take specific toxins out of the ground through phytoremediation:
clover - motor oil
mustard plants - lead
ferns - arsenic
alpine herbs - zinc
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