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John from Kennett Square, Pa writes

Is there a low cost pre-emergent for Japanese stiltgrass and PA smartweed that can be used in a perennial bed?


Pendulum AquaCap Herbicide 2.5 Gallon is labeled for smartweek as is Weed Impede which is a lower cost alternative that can be used around certain established ornamental plantings as listed on the label.  We apologize but are not aware of a pre emergent for Japanese stiltgrass.  Most university studies recommend a product containing the active ingredient of Pendimethalin which is what Pendulum contains but since not specifically labeled for it we cannot recommend it.  Acclaim Extra is a selective post-emergence herbicide that controls annual and perennial grasses around ornamentals listed on the label.

Answer last updated on: 02/01/2019

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Pendulum AquaCap Herbicide 2.5 Gallon

Pendulum AquaCap Herbicide 2.5 Gallon

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