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The invasive species they brought — like black mustard, tree tobacco and castor bean — slowly crept into the ecosystem.

“Those, over there, are actually castor bean stalks,” Kleckner said as we zoomed past.

Around 90% of oil is valuable for industrial uses in crops like castor beans, Bates said.

He was arrested after agents found a plastic bag with castor beans along with a handwritten recipe for extracting ricin from the beans, according to an FBI affidavit.

She later admitted to making the ricin - a poison made from the waste material left over from castor beans processing - at her Quebec home, and placing it into an envelope with the letter.