What Is Preen Weed Preventer Made Of?


Quick Answer

Trifluralin is the main active ingredient in the Preen Weed Preventer. The herbicide also includes 2,4-D, mecoprop-p, dicamba and dithiopyr, while some of the more specialized offshoots of the brand's products may include additional ingredients. Preen Vegetable Garden Organic Weed Preventer is 100 percent corn gluten meal.

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Full Answer

Trifuralin kills broadleaf weeds, although it purportedly has low toxicity in relation to humans. It is harmful to aquatic wildlife, and so those applying it should be conscious of fertilizing any landscapes that have runoffs into a nearby water source. The other ingredients in Preen Weed Preventer may also pose a risk to wildlife.

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