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Every spring and fall with pre-emergent, but still lot weeds???

last month

Every year, I followed the package instructions, air temperature, and SOIL temperature upon applying pre-emergent. I even followed the Clemson University weed control guideline to have 2nd application with different active ingredient (1st group: prodiamine and etc... 2nd group: Indaziflam) 6 weeks apart. However, there are a lot of weeds on the lawn with all kinds.

In my neighborhood, most people pay TrueGreen and etc to care their lawns for them. I only see them TWICE a year upon the time for spring and fall pre-emergent applications, and once maybe for fertilizer. That's all they've done, yet their lawns are always much better than mine. I'm even embarassed to say that my effort seems always going down the drain. I bet any nrighbor saw me sprayering and watering would pity me "what's wrong with what she has done; her lawn is a mess?"

Really, I don't understand!!!!!!!!!!

What could happen?

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Comments (3)

dchall_san_antonio
last month
I've seen your name before, but I don't remember where you live. Can you refresh my memory?

What are the directions on the package? I'm just curious, because it seems like every season is arriving several weeks earlier than the historical averages.

I'm fairly anti chemical, but I have used some strong stuff against existing weeds. I've never used preem before, but my wife is insisting. So, in San Antonio I am going to try preem for the first time next fall/winter. The first app will go down in September. Second will go down in December. Third will go down in late Feb. I have not thought any deeper than timing.
jjjjade H
Original Author
last month
7B Metro Atlanta.

Andersons Barricade Pre-Emergent Herbicide should be applied after the last frost of the spring but before weeds begin to germinate. For optimal control of crabgrass, you'll want to apply it to your lawn before the soil temperature warms to 55 degrees. You can also apply in the fall once soil temperatures fall below 50 degrees but before the ground freezes.

Scotts Halts Crabgrass and Grassy Weed Preventer is a potent herbicide formulated to prevent crabgrass, oxalis, foxtail, spurge and certain types of weeds even before they start germination. This pesticide comes in a 10.06 lb. bag which can cover up to 5,000 square feet applied in early spring and in the fall.
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Whereas I've generally found pre-emergents to be of considerable benefit. They're far from perfect, so the difference between 10,000 sprouting weeds and 1,000 isn't exactly going to thrill you, that's still a lot of weeds. Over time, that can be reduced with judicious use of herbicides and/or effort. In my case, the number of yearly incursions of nasty stuff is essentially down to quite minimal, perhaps 20-40 depending on the year. Pre-emergents aren't a cure for poor lawn care, but in conjunction with it and with working on your lawn to improve its thickness and health, they can certainly reduce the number of headaches you get. Make sure to choose a pre-emergent compatible with Bermuda (Barricade/Prodiamine I know is, but I'm not sure about others unless I do the research). Plus mind how long the shield lasts--it does vary from 1 month to around 1 full year depending on which one you choose and the amounts that are safe for your grass. You'll want to apply again, or apply another product, when the shield drops.
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dchall_san_antonio
last month
" should be applied after the last frost of the spring but before weeds begin to germinate "

That is hilarious. We only had one frost this year and our weeds were already at full speed. Again the problem, especially this year, is you cannot predict when the "last frost" is or even was. You just have to apply the stuff and count on it working for several weeks to months as the label says.

For people who live in an area where forsythia grows, the common folklore was to apply the herbicide when the forsythia begins to bloom. Those blooms mean the soil is warmed up enough for weed seeds to germinate. We don't have forsythia in San Antonio, so I can't tell you when that signal might come up, but I can tell you we had spring weeds coming up in December of 2023. Chalk it up to Global Warming, I guess.

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