Buckthorn, an invasive plant species, can be killed by spraying the plant with a herbicide. Spray with Glyphosate to kill buckthorn and surrounding plants. To kill buckthorn without harming nearby grass, spray with Triclopyr. Follow label directions when using either of these chemical products.
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Kelli Bingham is a freelance writer with nearly a decade of experience in the field. Her works have been published in publications including eHow. She is currently pursuing a degree in business.