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One major problem is the erratic flowering and seeding. Since the plant has no particular season for flowering, it flowers anytime it is growing. These flowers then produce seed, which replant. This means, that it never stops reproducing itself for the entire growing season! Hence the need for season long control. Once the plant dies back for the winter, it should be attacked early when greening first begins, or it will rapidly grow out of control.
Use of contact herbicides is effective in controlling the plant tops, but does not necessarily kill the entire plant. Since the plant is perennial, it may come back. Systemic herbicides like 2,4-d and glyphosates are effective. Late season treatments will require the maximum dosage, and may not be completely effective. New growth occurs almost immediately. This may be result of the plants built in survival mechanisms. Any damage seems to spur new plant development.
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