Using Products Properly
How Soon Can I Reseed After Using Roundup® For Lawns Products?
Roundup® For Lawns is so effective at killing weeds that you may find some bare spots in your lawn after all those pesky weeds die. If you’re looking to liven up your lawn again, turf species listed on the label can be seeded into the treated areas four weeks after application.
WAIT UNTIL YOUR LAWN ISN'T SO GREEN
If you’re thinking about applying Roundup® For Lawns to a newly seeded area, you should wait until your new grass is not so new—approximately six weeks after seedling emergence or after the third mowing is a good rule of thumb.
"For newly sodded, sprigged, or plugged areas delay the application of this product until three or four weeks after your project is completed."