The Q&A Archives: What Is The Best Weed Killer For Poison Oak And Ivy

Question: What is the most effective WEED KILLER for Poison Oak and Ivy?

Answer: An herbicide containing glyphosate formulated for brush and applied (and possibly reapplied) according to the label instructions should do the job. Note that a late summer, early fall application (while the roots are rebuilding reserves) can be more effective than a spring application as well.

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