Thlaspi caerulescens (J.Presl & C.Presl), have been shown to reduce the levels of a combination of toxic metals, including copper, through phytoextraction, over several days of application . Whereas, through rhizofiltration via the plant root system, sunflower Helianthus annuus (L.) can substantially reduce copper levels amongst other heavy metals overnight . The Fabaceae family includes species that are generally tolerant accumulators of heavy metals .