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Jeff from Ct writes

If killing the old grass and replanting new grass seed, will Grass Out Max (Clethodim Herbicide leave a residual in the soil that will prevent new grass seed from germinating?

I'm looking for a quicker way to kill the existing grass so the tiller process can be quicker. If this does leave a residual in the soil, can I add 1 or 2" of fresh soil on top that will help the new grass seed germinate?


If you are looking to kill all existing grass/plants in an area so that you can reseed with a new or different type of grass, the best way to do this is with any Roundup or non selective type product. Roundup and similar items on the market like X-Out and Avenger will will burn down the existing vegetation and break down in the soil within 1-2 weeks to allow you to replant without fear of damage to the new seed. Grass Out Max would require you wait at least 30 days after an application before planting new seed. If you wanted to bring in fresh soil that does not have chemical residual in it you are welcome to do that. 

Answer last updated on: 04/23/2021

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