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The best time to apply the preemergent herbicide is when the soil temperature reaches 55 to 60 degrees Fahrenheit.—Tim Johnson, Chicago Tribune, 14 Aug. 2022 If crabgrass has been a problem in years past, put down a preemergent herbicide in the spring before crabgrass germinates.—Arricca Elin Sansone, House Beautiful, 12 Apr. 2021
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