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Too late to apply pre-emergence (CGM)?

12 years ago

Hi, folks. Here in Round Rock, TX it's been really warm for several weeks now. I am wondering if it is too late to apply corn gluten meal for pre-emergent weed control. I don't have many weeds in my lawn--almost none in my front lawn due to hand-pulling--but I am starting to see weed shoots popping up all over the place.

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Comments (4)

dchall_san_antonio
12 years ago
Way too late. Remember when it first rained back in February and the temps were warm? That was the time. Soil temps never really dropped off this winter so the first rain storm was the time to apply.
texas_weed
12 years ago
Way way to late. CGM is a very expensive decent fertilizer but completely worthless as a herbicide.
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The forsythia for us started blooming early this week and the grass started greening up around the same time. These last few weeks of warm weather has things moving a little earlier this year. Since you're a little cooler than us, I'd say you're alright with your pre-emergent timing.
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Corn meal isn't the pre emergent. The pre emergent is Corn Gluten Meal. The time to apply CGM is when the forsythias bloom. If they bloomed some time ago, you're too late.
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The right time is when air temps are consistantly above 55Â° for a week or so. I guess that means you were a little late, huh? With temps as whacky as they have been, the forsythias blooming might not be a good indication any more. I wouldn't worry though. Most of the pre-m products also have some post-m efficacy. You'll probably get a few but not too many to pull.
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Thanks for the reply. I know the best defense against weeds is a healthy, dense turf, but the more I read the more I realize that apparently there are all types of weeds trying to grow at any given time. Some in spring, some in fall, some in summer or winter. Every 90 days would be 4 applications per year, so I don't think it would be too bad. Thanks again for the help. I just wasn't sure if there would be any negative effects to doing that as it seems most people only apply a pre-emergent in the early spring and fall.
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dchall_san_antonio
12 years ago
I didn't notice it was CGM. I agree with TW on that. I used 20 pounds per 1,000 square feet 8 times last season and never noticed a difference in weeds. I mean, how much do you have to use to get the effect? I was doing it to fertilize anyway. It is the best organic fertilizer I know of.
VisualCSharp
Original Author
12 years ago
Cool, I'll remember it for fertilization purposes then and go with some kind of other weed killer next season. Hand pulling, here I come!

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