When a site is contaminated with a low concentration of metals, can phytoremediation be implemented, and if so, how?
It depends greatly on "WHAT" metal is present, conditions of the soil (substrate) and climate.
For instance lead (Pb) can be taken up with sunflowers using EDTA as an adjunct.
Short answer regarding potential and variables regarding the process of phytoremediation. Considers different types of botanicals and the metals up taken. Includes several outlinks for further reference.