“In another study, phytoremediation with industrial hemp (Cannabis sativa) of soil contaminated with two PAHs (benzo[a]pyrene and chrysene) was studied. Hemp
showed a very high tolerance to the contaminants and levels of both PAHs were significantly reduced in soil planted with hemp in pots (Campbell et al. 2002).”
http://pss.uvm.edu/pss269/pdfs/9-Review_phytoremediation_aromatics.pdf