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Discussion in 'Homeowner Assistance Forum' started by mlong30, May 14, 2008.
After using a Grass Killer like RoundUp, how long should I wait to put down grass seeds?
Look at section 5.0 "General Information" on this label for Roundup Pro, which is 41% glyphosate.
(You may be using some type of "retail Roundup" much less than 41% A.I....but that should be relative because the mix rate per gallon (etc) is quite lower as the A.I.% gets higher.)
The part that talks about "No Soil Activity" would apply to your situation, although the label doesn't go into seeding specifically...probably for reasons of general product liability.
It's a general industry practice, during renovation season especially, for a contractor to do the Roundup work on one given day, and then just make sure the active ingredient is "watered in" in some manner.
(Watering also increases the growth rate...which expedites the gradual "killing" process of the A.I. glyphosate, too !!)
Then maybe, two to three days later, the actual renovation process begins.
But I've also known some folks who habitually spray and seed on the same day...and claim they've had "no problem whatsoever".
They just say to make sure the Roundup's "good and dry" before doing any seeding...and you're OK.
But I like to "error on the side of caution"...a bit more than they do!