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Michigan's Invasive Species Community

Emily Finch

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  1. Just stumbled on this thread searching for info on this plant via google. In Indiana it's a common problem in landscape areas, with a handful reports of it spreading to nearby natural areas. I have some landowners battling it but I don't think we have enough escaped populations to classify it as invasive (yet?). Dawn Slack reported using 2 percent Rodeo by volume and adding 0.015 percent of imazapyr on hard to kill populations (1 teaspoon imazypr per gallon of spray, any more and you risk off target damage). It sounds like you can physically dig it up, but it's pretty labor intensive and the rhizomes have a tendency to break off.
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