I recall years ago reading an article on using a similar process to pull contaminated radioactive metals out of the ground. Seems quite a number of plants require metals to grow properly.
As much as the forced hype on IoT, I still feel TNBT (The next big thing) is bioelectronics. Since plants can pull the carbon out of CO2 to build structure, a method similar to FDM 3D printing using organics, should be able to lay down layers of Graphine or even possibly the diamond matrix.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.