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Don from Kirksville, Missouri writes

If a pasture is sprayed with Grazon, then fed to cows, then the manure composted, would it kill my garden to use the compost in it?

If that manure is composted and put in my vegetable garden, will the Grazon kill my plants? I ask, because I've read several articles where gardeners have used composted cow manure, then their gardens died, After talking to the farmers, they had sprayed their fields with Grazon, and that residual amounts killed their vegetable gradens.

Answer:

Per the label, "Do not use manure from animals feeding on hay treated with GrazonNext HL Herbicide in compost". Also, "Do not transfer animals grazing or feeding on hay to areas where sensitive broadleaf crop occur without first allowing 3 days of grazing on an untreated pasture. Otherwise, urine and manure may contain enough aminopyralid to cause injury to sensitive broadleaf plants."

Answer last updated on: 02/04/2021

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