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Using roundup after seeding and before germination

I sprayed area with Roundup before sowing Zinnia seeds and would like to spray again before the seeds germinate. Will Roundup hurt the seeds? Does Roundup stick to seeds and then kill the emerging seedlings?

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Yes it will. Use on mature plants only

Posted on May 30, 2010

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Sprayed Roundup Pro at 2oz/gal on a field today. Will a week be long enough to waite prior to tilling and seeding with fall clover?


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Aug 27, 2011 | Roundup "" Weed & Grass Killer

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I have treated the area with roundup for about a 70% kill rate. A friend just mowed over the area. Will this impact the ongoing kill, and do I need to spray the area again?


When was the field mowed after spraying? If it was after three days, then the plants that were treated will die off. You probably should plan to retreat the areas that weren't killed after those plants are growing again. (It will take a few days depending on moisture and other conditions.)

In general, you can spray any missed plants 7 days after the first treatment. Then mow or seed the area 3 days after the second treatment.

If the field was mowed prior to the three days after the first treatment, retreat the entire area after the new growth begins.

For specific details, read the label for your Roundup product. Scotts has the label at the bottom of their product pages. All of the Scotts Roundup products are listed here: http://www.scotts.com/smg/catalog/productCategorySubSelf.jsp;jsessionid=64F09279DC15FE8877450FE65C85C38E?itemId=cat50096&navAction=jump . Select the specific one you used and click on the View Product details link. Then click on the View Label link. For example the label for the Roundup RTU (ready to use) Pump and Go Spray formulation is here: http://www.scotts.com/smg/products/round_up/kill_and_prevent_weeds/pdf/BasePNG.pdf .

I hope this helps.

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When can you sow grass seed after you have sprayed weeds with roundup


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Apr 24, 2011 | Roundup "" Weed & Grass Killer

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How long do I need to wait to reseed / sod lawn after applying roundup?


If you use Roundup or equivalent (do not use the long-acting product with a pre-emergent). Then you can reseed three days after the treatment. Do check the label for your specific product for any directions that differ for the reseeding schedule.

Some specific treatment limits: First some lawns will require two treatments with Roundup before reseeding (or planting sod). So wait 7 days after the first application to identify any green (growing) spots and then retreat. After all existing lawn grasses and weeds have been treated, you can rake the area and then put down sod or grass seed 3 days after application.

Second: for best results the plants treated with Roundup need to get rain or irrigation a few days before the application and 2-3 days after the application. (This is true if the soil is dry when you are getting ready to plant.)

I hope this helps.

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(the labels for several Roundup products are here: http://www.scotts.com/smg/catalog/productCategorySubSelf.jsp?itemId=cat50096&navAction=jump . Click on product information and then the label.)

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How to propagate a calamansi seeds?


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