The pair proposed a process called phytoremediation, which uses different types of plants to remediate the soil. Amsden said plants such as common ragweed, sunflowers and even hemp and cannabis, can be used to draw out different toxins from the soil.
http://www.beloitdailynews.com/news/illinois/bc-students-develop-environmental-art/article_36e7d38a-8216-11e4-963f-3b6bd8713cbe.html
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