What is Phytotreatment?

Legal Definition
Phytotreatment is an environmental term referring to the cultivation of specialized plants that absorb specific contaminants from the soil through their roots or foliage. This reduces the concentration of contaminants in the soil, but incorporates them into biomasses that may be released back into the environment when the plant dies or is harvested.
-- Wikipedia
Legal Definition
A method by which substances that can contaminate the soil are removed from the soil through the plantation of new plants.