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No, Brash does not kill ironweed.

Specifically, the herbicide in question can be found under the product name Brash or Weedmaster. It contains the active ingredients dicamba and 2,4-D amine. Under the best circumstances, it controls ironweed (Vernonia spp) by about 75%. It demands repeated applications since the purple-flowered, tall perennial often responds with 75+ regrowth.

A more effective combination is an herbicide whose active ingredients include 2,4-D and triclopyr.

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11y ago

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