Be very careful using Aminopyralid. if the cows or horse eat the grass treated or hay treated it passes thru intact. Lost a large part of my tomatoes and potatoes to composted cow manure that contained was contaminated by this. Minute concentrations of picloram, clopyralid and aminopyralid, as low as 1 ppb (parts per billion), can be lethal to sensitive garden plants such as peas, beans, lettuce, spinach, tomatoes and potatoes.
Takes years and years to get cleared from soil.
Only good plant to put in affected garden soil is corn.
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