For the first time in the US, a genetically modified (GM) crop has been found growing in the wild, flourishing in the form of roadside weeds across North Dakota. The canola plants, engineered to be resistant to certain herbicides, apparently spread when seeds blow from fields or fall out of trucks carrying the crops to market. How problematic this might be is subject to debate, but critics of GM crops have long warned that it would be difficult to keep them from spreading with unwanted consequences. Indeed, the biotech canola has even been found growing wild in Japan, which merely imports the crop and does not grow it.