Weeds as the westerner farmer understands them to be are often transplanted from other parts of the world and without a natural predator, and can take over fiel

Weeds as the westerner farmer understands them to be are often transplanted from other parts of the world and without a natural predator, and can take over fields pushing out the crop. http://www.npr.org/2017/06/14/532879755/a-pesticide-a-pigweed-and-a-farmers-murder http://www.npr.org/2017/06/14/532879755/a-pesticide-a-pigwee... Mom fights a never ending battle with foreign weeds like knapweed (from eastern Europe) and Canadian thistle (from southeast Europe and Asia) that was introduced thru contaminated seeds. Every year she sprays and manually digs the weeds out of the ground. Edit: also should point out that what we call weeds push out the local plantlife too. I also forgot kudzu, the weed that (or didn't? depends who you ask) ate the south. https://www.thevintagenews.com/2017/05/04/the-vine-that-ate-the-south-the-invasive-plant-kudzu-is-swallowing-the-southeast-of-the-us/ https://www.thevintagenews.com/2017/05/04/the-vine-that-ate-... http://www.smithsonianmag.com/science-nature/true-story-kudzu-vine-ate-south-180956325/ http://www.smithsonianmag.com/science-nature/true-story-kudz...