Phytoremediation is proposed as a cost- effective alternative for the treatment of contaminated soils. Topsoil would be preserved and the amount of hazardous materials reduced significantly.(4) The main factors controlling the ability of phytoextraction are plant species, metal availability to plant roots, metal uptake by roots, metal translocation from roots to shoots and plant tolerance to toxic metals. There are many types of plants currently used in phytoextraction, such as Thlaspi carerulescens, Alyssum murale, A. lesbiacum, and A. tenium, which can accumulate high levels of Zn and Cd in shoots. However, the remediation potential may be limited due to the slow growth and low biomass of these plants.