We have been invaded (100-150 years ago) by a number of foreign plants, many from eastern Europe. In their homeland they had natural enemies, such as insects or plant diseases that kept them under control, but when our early settlers accidently brought them to America the natural enemies did not come with them. The Scotch thistle that Blake is spraying here has formed several stands on the ranch that not only crowds out forage, but are so dense cattle cannot walk through the infested areas.
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