When is it too late to apply the pre-emergent application?

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Annual weed seeds such as crabgrass will begin to germinate when the ground temperature reaches 55 degrees for at least 5 or more days in a row. Typically, this occurs in our area around the 2nd week in April. We monitor the ground temperatures very closely in the spring and when the temperatures reach 55 degrees we switch to a post-emergent treatment for control of annual weeds.

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