Pre-emergence herbicide - Knowledgebase Question

Clayton, No
Question by hvnichols
February 9, 2011
When is the best time to prevent weeds with a pre-emergence herbicide?


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Answer from NGA
February 9, 2011

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Rather than a selecting a specific date for pre emergent herbicide application, watch the weather - Crabgrass and other summer weed seeds start germinating when soil temperatures are 50 to 55 degrees F for ten or more days. Apply just prior to that and your pre emergent should be effective in keeping those weed seeds from germinating.

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