Link to paper: https://doi.org/10.1038/ncomms3614 https://doi.org/10.1038/ncomms3614. The underlying reason for this seems to be that Eucalyptus roots are unusu

Link to paper: https://doi.org/10.1038/ncomms3614 https://doi.org/10.1038/ncomms3614. The underlying reason for this seems to be that Eucalyptus roots are unusually deep and aggressive (something I have personally witnessed), and any gold they pick up is toxic and gets transported to the leaves, where it can’t do as much harm.