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preemergence treatment for weed seeds

To clarify, do NOT reseed until you are certain that the weed preventer is no longer active. 

Let me give you some general concerns to consider for your situation. I cannot be exact since I do not know which Vigoro product you used. 

QUESTION 1:  When Should I Apply Pre Emergent and Reseed?

BUT… maybe you’re an Action type of guy, chewing your fingernails while waiting…..

So if you try to short-circuit the designed traits of the pre emergent earlier than recommended, Mr. Murphy would likely kill the grass and let the weeds through. 

So what do you do? You can hope for the best by working around the unchangeable.  Every yard situation is different, but knowing a few basic principles should point you in the right direction.

Are there cultural practices that could help reduce the presence of the weeds?

As you’re developing or adjusting your weed control strategy, it’s important to ask yourself the following questions:

Developing a Weed Control Strategy

Important: Pre-emergent is not designed to control existing weeds or weed seeds.

All weeds have a survival strategy and cannot be completely eliminated because they have different life cycles and methods of reproduction. Seeds can lay dormant for years before they germinate, surviving drought, fire, and herbicide applications. Even if you were to completely clear a property of seeds, seed and vegetative propagules can easily be transported to the property by wind, water, animals or human activity.

Weed Classification: Summer Annuals