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bryce d
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Corn Gluten Meal as Weed Control?

has anyone ever tried this stuff?
If I don't answer quickly I'm out in the garden picking morning glory.

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rainbowgardener
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Re: Corn Gluten Meal as Weed Control?

Yes, I tried it. It is beneficial for your soil. It did not work very well to prevent weeds for me, but I suspect that's because I was too frugal with it. The stuff is really expensive.

$37 for 25 pound bag and here is what they say: Corn Gluten is a 100% natural weed preventor/all organic nitrogen fertilizer. For Established lawns: apply 10-20lbs/1, 000 sq ft 2x a year. To Established root system plants: incorporate 2lbs/100 sq ft into top 4-5 inches soil, repeat monthly during growing season. https://www.horseloverz.com/product/wee ... OgodLysAPw

So my small lawn would still use at that rate, almost the whole bag twice a year. I didn't use nearly that much, spread it very fine. Even spread fine, it worked as fertilizer - the section of lawn I treated with it was visibly greener than the untreated section. But just as weedy, possibly even more so. I suspect it fertilized the weeds too.

So I can't answer how well it would work to prevent weeds if you used it as directed.
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bcallaha
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Re: Corn Gluten Meal as Weed Control?

That is the main ingredient in Preen vegetable garden weed preventer. I haven't tried it, but thought I would this year.

Brad

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rainbowgardener
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Re: Corn Gluten Meal as Weed Control?

bcallaha wrote:That is the main ingredient in Preen vegetable garden weed preventer.
Brad
I'm sorry, but says who?

COMPONENT(S):
A,A,A-TRIFLUORO-2,6-DINITRO-N N-DIPROPYL-P-TOLUIDINE:
OSHA PEL: N* ppm
ACGIH TLV: N* ppm
STEL: NG ppm
PERCENT OF PRODUCT: EQ 1.47%
NOTE: * Trifluralin / PEL and TLV: N/L.
Celulose
OSHA PEL: 15 mg/m3
ACGIH TLV: 10 mg/m3
STEL: NG ppm
PERCENT OF PRODUCT: EQ 46.03%
CAS NO.: 9004-34-6
Corn cobs
OSHA PEL: 15 mg/m3
ACGIH TLV: 10 mg/m3
STEL: NG ppm
PERCENT OF PRODUCT: EQ 52.50%
CAS NO.: Not given

https://www.preen.com/msds/1006_2463802.ashx

so yes you could say the "main" ingredient is ground corn cobs, since it is 52%. But the active ingredients are trifluralin (46%) and A,A,A-TRIFLUORO-2,6-DINITRO-N N-DIPROPYL-P-TOLUIDINE

From the Preen label:

This pesticide is extremely toxic to freshwater marine, and estuarine fish and aquatic invertebrates including shrimp and oyster. Do not apply directly to water. Do not apply in a manner which will directly expose canals, lakes, streams, ponds, marshes or estuaries to drift or runoff. Do not contaminate water when disposing of equipment washwaters or rinsate. To protect the environment, do not allow pesticide to enter or run off into storm drains, drainage ditches, gutters or surface waters. Applying this product in calm weather will help to ensure that wind does not blow pesticide off the treatment area. Sweeping any product that lands on a driveway, sidewalk, or street, back onto the treated area of the garden will help to
prevent run off to water bodies or drainage systems.

https://www.preen.com/labels/2463802.pdf

also:

the herbicide trifluralin, an endocrine-disrupting chemical and possible human carcinogen...there is evidence that the pesticide has chronic health effects, even at very low doses, its use in agriculture should concern regulators, public health professionals and the public.
The use of trifluralin is unsustainable because of growing resistance problems. As it is highly toxic to aquatic life, it could jeopardise vulnerable populations of protected species. Its known tendency to volatilise, and to travel great distances in the atmosphere, mean that trifluralin could become a widespread contaminant. https://www.pan-uk.org/pestnews/Actives/Triflura.htm

and incidentally corn gluten meal is made from the corn kernals after processing for corn syrup, etc, not from corn cobs. So this is 52% corn cobs, but 0% corn gluten meal.

Actual corn gluten meal comes with no environmental hazard warnings -- it's corn!
Twitter account I manage for local Sierra Club: https://twitter.com/CherokeeGroupSC Facebook page I manage for them: https://www.facebook.com/groups/65310596576/ Come and find me and lots of great information, inspiration

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bryce d
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Location: Northern Utah, zone 6b

Re: Corn Gluten Meal as Weed Control?

I decided long ago that I was not going to put preen on my vegetable garden. I use very little chemicals except for fertilizer. I don't use as much fertilizer as someone could use.
I have thought about putting preen on the flower garden out in the front yard.
If I don't answer quickly I'm out in the garden picking morning glory.

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