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Best herbicide to kill grass for re-seed?

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51K views 17 replies 10 participants last post by  lawnpops  
#1 ·
I plan to kill my small front yard now and re-seed in about a month. I just don't know what product to use to kill my current grass. Any suggestions would be greatly appreciated. I also don't know how long I would need to wait to reseed after applying. Any help with that would also be great.
 
#2 ·
Glyphosate is what you want. Make sure it is just a pure glyphosate without anything else. You should be able to find in a 41% for example. Glyphosate is not the brand but the ingredient. Lots of companies make this. Here is a link for something you can get at home depot.

You can spray this even after you put the seed down, but before the seed germinates. It is common to spray this several times leading up to the seeding project (5-7 days apart) and then again the day you put the seed down.

https://www.homedepot.com/p/HDX-64-oz-Weed-and-Grass-Killer-HG-98025/204599806
 
#3 ·
Without question the best herbicide to kill everything before reseeding is glyphosate (RoundUp). Get the 42% glyphosate only vs the branded RoundUp sold in most stores.

https://www.amazon.com/Ragan-Massey-Glyphosate-Concentrate-Killer/dp/B01CNSSRZG/ref=pd_lpo_3?pd_rd_i=B01CNSSRZG&psc=1

Check out g-man's renovation guide thread for best practices. Good luck!

https://thelawnforum.com/viewtopic.php?f=9&t=16808
 
#4 ·
Stuofsci02 said:
Rkolarich15 said:
I plan to kill my small front yard now and re-seed in about a month. I just don't know what product to use to kill my current grass. Any suggestions would be greatly appreciated. I also don't know how long I would need to wait to reseed after applying. Any help with that would also be great.
Glyphosate is what you want. Make sure it is just a pure glyphosate without anything else. You should be able to find in a 41% for example. Glyphosate is not the brand but the ingredient. Lots of companies make this. Here is a link for something you can get at home depot.

You can spray this even after you put the seed down, but before the seed germinates. It is common to spray this several times leading up to the seeding project (5-7 days apart) and then again the day you put the seed down.

https://www.homedepot.com/p/HDX-64-oz-Weed-and-Grass-Killer-HG-98025/204599806
Thank you so much for the info and link! Very helpful.
 
#5 ·
gm560 said:
Without question the best herbicide to kill everything before reseeding is glyphosate (RoundUp). Get the 42% glyphosate only vs the branded RoundUp sold in most stores.

https://www.amazon.com/Ragan-Massey-Glyphosate-Concentrate-Killer/dp/B01CNSSRZG/ref=pd_lpo_3?pd_rd_i=B01CNSSRZG&psc=1

Check out g-man's renovation guide thread for best practices. Good luck!

https://thelawnforum.com/viewtopic.php?f=9&t=16808
Thank you for taking the time to help. I would have no idea what to do. Glyphosate it is!
 
#6 ·
Would Roundup QuikPro also work? I assume so since the product description says there's no residual soil activity.

Label:
https://www.domyown.com/msds/RoundUpQuikProlabel.pdf

*Glyphosate, N-(phosphonomethyl)glycine,
in the form of its ammonium salt.................................................................. 73.3%
Diquat dibromide [6,7-dihydrodipyrido
(1,2-a:2',1'-c) pyrazinediium dibromide] ........................................................ 2.9%
OTHER INGREDIENTS: ..................................................................................... 23.8%

Product Description: This product is a postemergent, systemic herbicide with no residual soil activity.
 
#7 ·
spaceman_spiff said:
Would Roundup QuikPro also work? I assume so since the product description says there's no residual soil activity.

Label:
https://www.domyown.com/msds/RoundUpQuikProlabel.pdf

*Glyphosate, N-(phosphonomethyl)glycine,
in the form of its ammonium salt.................................................................. 73.3%
Diquat dibromide [6,7-dihydrodipyrido
(1,2-a:2',1'-c) pyrazinediium dibromide] ........................................................ 2.9%
OTHER INGREDIENTS: ..................................................................................... 23.8%

Product Description: This product is a postemergent, systemic herbicide with no residual soil activity.
I would stick with the gly only products. Diquat is mixed in very often to give a visual appearance of plant damage faster than glyphosate (to appease impatient consumers itching to write a bad review), but it isn't actually any better. In fact it could make it worse if the diquat triggers some undesirables into dormancy and hinders the glyphosate's ability to be absorbed into the plant. I have also heard things about diquat being no bueno around trees, but that could be BS.

Edit. Don't get me wrong, QuickPro is still going to murder a lawn, so I would say if you have some packets on hand and want to use them up, sure, smoke em if you got em but if you are buying product to do a reno, stick with the cheap gly concentrate.
 
#8 ·
gm560 said:
spaceman_spiff said:
Would Roundup QuikPro also work? I assume so since the product description says there's no residual soil activity.

Label:
https://www.domyown.com/msds/RoundUpQuikProlabel.pdf

*Glyphosate, N-(phosphonomethyl)glycine,
in the form of its ammonium salt.................................................................. 73.3%
Diquat dibromide [6,7-dihydrodipyrido
(1,2-a:2',1'-c) pyrazinediium dibromide] ........................................................ 2.9%
OTHER INGREDIENTS: ..................................................................................... 23.8%

Product Description: This product is a postemergent, systemic herbicide with no residual soil activity.
I would stick with the gly only products. Diquat is mixed in very often to give a visual appearance of plant damage faster than glyphosate (to appease impatient consumers itching to write a bad review), but it isn't actually any better. In fact it could make it worse if the diquat triggers some undesirables into dormancy and hinders the glyphosate's ability to be absorbed into the plant. I have also heard things about diquat being no bueno around trees, but that could be BS.

Edit. Don't get me wrong, QuickPro is still going to murder a lawn, so I would say if you have some packets on hand and want to use them up, sure, smoke em if you got em but if you are buying product to do a reno, stick with the cheap gly concentrate.
+1.. Avoid Diquat... It may also mean you cannot reseed immediately...
 
#12 ·
I was just reading about the residual from using a Roundup type of grass killer. The article claimed the after effect stays in the earth for many years. Glyphosate stays around for a long long time and can leach into our food supply if not carefully monitored. I know some will post that farmers have used glyphosate on their food crops for years so it's already in our food supply. My question simply is......is there a viable alternative to glyphosate?
 
#13 ·
Bkeller500 said:
I was just reading about the residual from using a Roundup type of grass killer. The article claimed the after effect stays in the earth for many years. Glyphosate stays around for a long long time and can leach into our food supply if not carefully monitored. I know some will post that farmers have used glyphosate on their food crops for years so it's already in our food supply. My question simply is......is there a viable alternative to glyphosate?
Yep

Image
 
#14 ·
I'm about to give this a shot. It's pricey but it's 2.5G and will last a long time for myself.

https://www.lawnandpestcontrolsupply.com/collections/weed-control/products/mg-pro-organic-weed-killer-concentrate?_pos=2&_sid=400c69e1c&_ss=r

There are a couple of vids on youtube about it from GCI Turf but that's about it. I've been on chat with Mirimichi Green and they have been really really helpful. Going to try and get to it tomorrow.

https://mirimichigreen.com/wp-content/uploads/2018/04/WC-Concentrate-101217.pdf

https://mirimichigreen.com/products/weed-control-concentrate/

Cheers
 
#16 ·
Diquat might also have some real health risks, since it's related to paraquat. The research is out there, and there's some support. It's possible that some of roundup's bad reputation could be because of the diquat that's often added in versions of it. So, not only is straight glyphosate more effective at killing turf grasses, but it's probably be safer. I have a container of glyphosate with diquat, but haven't touched it in years now. I just use 41% glyphosate with ammonium sulfate and non-ionic surfactant added.
 
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#17 ·
Bkeller500 said:
I was just reading about the residual from using a Roundup type of grass killer. The article claimed the after effect stays in the earth for many years. Glyphosate stays around for a long long time and can leach into our food supply if not carefully monitored. I know some will post that farmers have used glyphosate on their food crops for years so it's already in our food supply. My question simply is......is there a viable alternative to glyphosate?
Um yeah, pretty much all produce at the grocery store is genetically modified and laden with herbicide and pesticides.

Don't worry though, the fda says it's ok.