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My lawn and at least one of my garden beds have been invaded by mugwort, which has to be the kudzu of the North in terms of fast invasive growth. Weed-Be-Gone didn't touch it. What can I use to kill this stuff?
Mugwort is sometimes called wild chrysanthemum weed; it actually is a perennial Artemisia that spreads quickly by underground runners. It is almost impossible to dig out as it quickly re-grows into large patches from even a tiny piece of remaining root. Don't let it go to seed this fall; cut the tops off a couple of inches from the ground. Paint or carefully spray the remainder with glysophate. If the mugwort re-sprouts, respray. Over the next year watch vigilantly for new sprouts that may pop up here and there and spray them promptly. Be careful not to get the glysophate on surrounding plants that you desire to keep.
Sometimes it's best to dig up your valuable plants, remove all the soil with a hose carefully separate out all of the mugwort roots and replant the good plants temporarily in another area. Then you can overspray the entire weed infested area with glysophate.