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Anne from Horsham, Pennsylvania writes

Best herbicide to kill Pennsylvania Smartweed in turf during mid to late spring in Pennsylvania?

Have a very stubborn and dense infestation of Pennsylvania Smartweed. Have used Speedzone last couple of years only to have it come back again. What am I doing wrong? Should I try another product, maybe Surge? Do I need to add anything to a herbicide?


SpeedZone will only kill the weeds that you spray directly it does not prevent anything from coming back.  You can help prevent the smartweed from coming back by using a pre-emergent such as Weed Impede to help prevent it from growing.

Answer last updated on: 05/05/2014

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