Can I put dow crabgrass preventer if it is going to rain the next day

Yes, crabgrass preventer needs to be dissolved to work.  However, it is too early for it to be applied.  Applied too early, it is broken down and gone by the time the crabgrass seeds are sprouting  HERE’S a link all about Applying Crabgrass Preventer and, later on, weed and feed.

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