Posted by
Message
Glock17
Chicago Cubs Fan
Member since Oct 2007
19689 posts

Post weed cocktail question
I sprayed my second round today.

2 questions:
How long should I wait before cutting grass? Would Wednesday or Thursday be fine?

When should I hit it with fertilizer? I was thinking in 2-3 weeks


ronk
Member since Jan 2015
1525 posts

re: Post weed cocktail question
You’d be perfectly fine to cut on either of those days. I’m assuming your grass is already pretty green. Fert it this weekend.


jyoung1
LSU Fan
Lafayette
Member since May 2010
1648 posts

re: Post weed cocktail question
I thought it was too early to fertilize?


Glock17
Chicago Cubs Fan
Member since Oct 2007
19689 posts

re: Post weed cocktail question
quote:

I thought it was too early to fertilize?


I was told after 2 “real” cuts to put out fertilizer... I say this one would be my first true cut where I’m not just cuffing weeks


CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1538 posts

re: Post weed cocktail question
The 2 real cuts of grass is just a rule thumb in regards to fertilization but I think a good one as it does signify that your grass is active growth and ready for fertilizer, but ii would be fine to put it out sooner if you can time the application before a nice watering in rain.


jyoung1
LSU Fan
Lafayette
Member since May 2010
1648 posts

re: Post weed cocktail question
So say this weekend? If it’s still supposed to rain Monday & Tuesday?

I would not say I’ve had my first “real” cut yet. But I think in about a week it’ll be time.


gamecocks22
South Carolina Fan
SC
Member since Dec 2012
4805 posts

re: Post weed cocktail question
The real question is what type of grass? If centipede I would wait til full green-up


DukeSilver
Houston Astros Fan
Member since Jan 2014
1464 posts

re: Post weed cocktail question
What are the do’s and donts on using it on St Aug?


Theboot32
LSU Fan
Member since Jan 2016
2160 posts

re: Post weed cocktail question
Can I still put out cocktail or is it too warm? Have a few spots I must have missed on first round


Replies (0)
Replies (0)
00
CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1538 posts

re: Post weed cocktail question
quote:

So say this weekend? If it’s still supposed to rain Monday & Tuesday?

I would not say I’ve had my first “real” cut yet. But I think in about a week it’ll be time.


Your call you’ll be fine either way, I’m in BR and I fertilized my St Aug backyard this past weekend. I’ll wait to at least April 1 for the centipede front yard - almost greened up all the way but not quite.

Interesting tidbit - 3 neighbors across the street with centipede lawns, and a southern exposure, are fully greened up, the width of street distance between us, my centipede lawn with a northern exposure is about 7-10 days behind as well as other neighbored down the street with centipede lawns and a northern exposure.


TD SponsorTD Fan
USA
Member since 2001
Thank you for supporting our sponsors
Advertisement
CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1538 posts

re: Post weed cocktail question
quote:

What are the do’s and donts on using it on St Aug?

Safe to use on St Aug at temps below 85 F (atrazine + weed-free-zone mixture), but you should use other selective post emergent herbicides at higher temperature, MSM Turf and Celsius both mentioned here are good ones which is safe on St Aug, centipede, Bermudagrass and zoysia. In southern Louisiana, Gamecocks22 and ronk have cautioned use on MSM Turf on St Augustine during the green-up phase, but I think we’ve passed that phase in southern Louisiana.


jyoung1
LSU Fan
Lafayette
Member since May 2010
1648 posts

re: Post weed cocktail question
I have St. Aug. these are soil results from test i did last year:



I went to HD and got some Scotts southern lawn fertilizer which is 32-0-10. I chose that over the vigoro which was 29-0-4.

My soil test results says to use 12-4-8, and from results it looks my soil doesn’t lack as much nitrogen as it does P & K. Is there something better that I need for my Lawn that perhaps i can get at a local feed store?

I also was thinking of using milorganite. Should i use that in addition to the fertilizer or instead of? Or not at all?

ETA: I sprayed my lawn 3 weeks ago with winter cocktail, and I sprayed it again lightly today even though I didn’t really see any weeds.

Thanks for help in advance.
This post was edited on 3/24 at 3:58 pm


jimbeam
USA Fan
University of LSU
Member since Oct 2011
59994 posts

re: Post weed cocktail question
Not sure if you care but your name is listed


Replies (0)
Replies (0)
00
CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1538 posts

re: Post weed cocktail question
quote:

My soil test results says to use 12-4-8, and from results it looks my soil doesn’t lack as much nitrogen as it does P & K. Is there something better that I need for my Lawn that perhaps i can get at a local feed store? I also was thinking of using milorganite. Should i use that in addition to the fertilizer or instead of? Or not at all? ETA: I sprayed my lawn 3 weeks ago with winter cocktail, and I sprayed it again lightly today even though I didn’t really see any weeds.

Interesting results - surprised your P and K is so low in the Lafayette area - results one might see in the piney wood areas of the state. By and large how does your St Aug look, visually and health wise?

Anyway, ignore the Total N - the N requirement for the lawn is not based on a soil analysis. LSU AgCenter doesn’t do a N analysis on soils b/c fertilizer recommendations are not based on it. Apply the 32-0-10 fertilizer you bought at 3 lbs per 1000 sq ft to provide the 1 lb of N your St Aug needs per 1000 sq ft.

For the low P follow their P recommendation of 3.25 lbs of 0-45-0 per 1000 sq ft using this or another brand LINK but split that application over 3 top dressings - 1.25 lb in April, 1 lb in June and 1 lb in August.

For the low K, follow their recommendation of 9.5 lbs of 0-0-60 per 1000 sq ft. Look for this or another name brand LINK and split the application over 3 top dressings as you do with P, 3.5 lbs per 1000 sq ft in April, 3 lbs in June and 3 lbs in Aug.

In June and Aug you can apply another 3 lbs per 1000 sq ft of the 32-0-10 or something comparable. St Aug responds well to nitrogen applications. And cut your St Aug high - 3 to 3 1/2 inches.

Then next winter, Jan/Feb have another soil lawn analysis done by the LSU Ag Center to see where your soil fertility stands after these supplemental fertilizer additions.

Do the math, for the lawn area you have, and see how many pounds you’ll need of 0-45-0 and 0-0-60. You can probably buy 50 lb bags of them at a feed & seed store in Lafayette area, Abbeville, Crowley, etc. much cheaper per pound than the small bag Hi Yield brand, that is more for vegetable gardeners that don’t need much.

I can’t comment on milorganite as I’ve never used it - those that post on the this board that use it love it and I have nothing against it, but it has a 6-4-0 analysis and it’s not going to help address your P and K deficiencies. I’ve never seen a 12-4-8 organic fertilizer, might have it in Washington state where the soil analysis was done - they are big on organics in the Pacific NW.

P.S. Lastly, you don’t need to spray post-emergent herbicides for weeds that you don’t see, only the pre-emergent herbicides for weeds you don’t see, at the appropriate times of course.


jyoung1
LSU Fan
Lafayette
Member since May 2010
1648 posts

re: Post weed cocktail question
This is perfect. Thank you!

Grass looks healthy, minus the small patchy areas in between where the clovers and stuff were. Soil is mostly clay, idk if that had anything to do with low P & K.

ETA: that winter cocktail was deadly, almost every weed was dying within a day. And after 2 weeks or so every weed was gone.
This post was edited on 3/24 at 7:01 pm


ronk
Member since Jan 2015
1525 posts

re: Post weed cocktail question
A lot of good stuff that craw said. I will say that a double 0-62 comes in a wetable powder which is great. As far as their recommendations nobody is going to use 34lbs of 12-4-8 per thousand. That is a ludicrous amount for someone to buy and apply.


DukeSilver
Houston Astros Fan
Member since Jan 2014
1464 posts

re: Post weed cocktail question
quote:

Safe to use on St Aug at temps below 85 F
Thanks for the info.

I'm in Houston so it's been in the high 70s and low to mid 80s, is it too late for me to use the formula or should I still be good to go for some spot spraying?

Looks like its in the mid 80s for the next 3 days and then a straight week of the highs being in the 70s, on my weather app at least.


jyoung1
LSU Fan
Lafayette
Member since May 2010
1648 posts

re: Post weed cocktail question
Chastant’s in Lafayette didn’t have 0-45-0 so this is what I got. I’m assuming I can still follow Craw’s instructions, and a little extra nitrogen won’t hurt?



Also, how do you measure weight of fertilizer? Is there a volume conversion? I mean I have a little food scale that I can maybe use.

ETA: just measured front lawn and it’s about 1,150 sq. Ft.
This post was edited on 3/25 at 11:03 am


ronk
Member since Jan 2015
1525 posts

re: Post weed cocktail question
This might sound highly technical and unfortunately I don't have an answer for your specific spreader unless you sent all the info on it.

I have a lesco 80# spreader. If I calibrate it on 14 and I walk at 3.2 mph I will put down 4lbs of product per minute per thousand square feet. With the fert I use I always apply 4lbs per thousand.


jyoung1
LSU Fan
Lafayette
Member since May 2010
1648 posts

re: Post weed cocktail question
So this is my spreader: LINK

Per the instructions on Scotts southern lawn fertilizer, it says if you set spreader to 3 1/2, it will apply 2.8 lbs per 1,000 sq ft.

So I can use that setting for the scotts bag, but not sure what setting to use for the P & K feed, to get 1-1.25 lb of P and 3-3.5 lb of K.
This post was edited on 3/25 at 11:31 am


Replies (0)
Replies (0)
00
first pageprev pagePage 1 of 2next pagelast page

Back to top

logoFollow TigerDroppings for LSU Football News
Follow us on Twitter, Facebook and Instagram to get the latest updates on LSU Football and Recruiting.

FacebookTwitterInstagram