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Roundup??????

G

Greg1959

Well-known Member
Does Roundup lose potency after time?

I have a 2.5 Gallon jug of Roundup concentrate that I forgot about. I had used about 1/2 gallon from the jug 4 or 5 years ago.

Last week I mixed up a sprayer with double the strength recommended and sprayed some fence rows.

Today, I went to check how it worked....it just seems to have enhanced growth and hasn't killed the weeds.

I know how Roundup works and a burst in growth can be expected but....after a week of dry conditions, I expected to see some wilting.

Nothing.

What are your experiences????

I'll buy some new jugs in the morning.
 
Read the label. Don't know about strength loss, But it takes 3 - 4 days for that stuff to show that it worked. HTH
 
I only use Roundup for spot spraying by hand, and have two jugs of 41% pushing ten years old. No problem, I don't mix extra strong and it still works fine.
 
It can take up to a week to see any results especially if its been cool out. I would give it a few more days.
 
Boss picked up an unopened jug of Round Up at an auction he went to a few months ago, guy said it was about 5 years old, and it did the exact same thing. Acted more like fertilizer than Round Up, and even had kind of a fertilizer smell to it when our grass guy sprayed it. a few weeks ago. Never did kill the grass.
 
I have applyed acording to directions and also commercialy applyed and it has never killed a weed, don't know if it will kill flowers but I need to try. Something Grandma had 40 years ago and it has taken over the entire yard.
 
I have used it here in Mi. this time of year and not seen any results for two weeks. Due to the colder temps. I don't know about its shelve life but I've used old 2-4-D that's worked ok.
 
I notice that the Roundup label says, "Protect from freezing". It always makes me suspicious of my left-over Roundup, because I store it in an unheated building.

I spot sprayed Roundup last week, and nothing is dead yet. . .

Patience. . .
 
Over the years, I have sprayed many gallons of RU. Learned from experience that you don't spray when vegetation is under drought conditions.
I always mixed 2oz. to every gallon of water and added a about one teaspoon of dish liquid.
Like was said, a lot depends on temperature and growing conditions.
I sprayed about 4 gal. four weeks ago and it took about two weeks to kill?
RU was about two years old, so, no I do not think age cuts ability to kill but freezing probably would.
 
My wife sprayed some bromegrass with some 5 yo RU that had been stored in a cold shed. She wanted a garden and did it when it was a little cool. She looked at it every day for a week and a half kept saying she had to spray it again with new. Told her just to wait for warmer weather it'll work. Surprisingly she listened to me and yesterday after a few warm days the brome was pretty well dried up. Now I can work it up for her and she'll start with a clean garden.
 
Glyphosate has a minimum shelf life of 8 years if stored properly , cool dark place ( not freezing cold )

The plant best absorbs glyphosate while it I'd actively growing , then it inhibits growth by blocking photosynthesis essentially starving the plant . During hot dry weather the plants are not "eating" much so results are poor . The roots may absorb some glyphosate but it usually causes discoloration . Avoid spraying under fruit trees as it may spot the friut next year . Bad results are usually from improper application . A suficant such as dish soap is very effective on waxy foliage . For tree stumps a few ounces poured on top of the fresh cut stump will help prevent regrowth .
 
I just do a little spot spraying, so just finished up a jug of Roundup that I bought 40 (yes, forty) years ago. Still was working fine. Kind of sorry to see the jug go, it had some sentimental value. Was always stored in an open outside shed, had been to 0? several times over the years.

Almost that 40 years ago, I sprayed a patch of blackberries before I went to work in town. Got home, and there was a big bowl of berries on the table. Seems the kids babysitter had brought them back to our house, and they had picked (and eaten) the berries that I had just sprayed that morning. I called Monsanto in a panic, and told them what had happened. They said all their research indicated that the product was harmless to animals, but to contact them if there was any adverse effect. The kids in question are now a commercial writer, a civil engineer, and a high school Spanish teacher. I'm cautiously optimistic that there may not be any blowback from them eating those berries.
 
In addition to spraying many gallons of RU, I also have killed many weeds in gardens and flower beds, by using full strength.
Use a small paint brush, or even a Q tip to paint one or two leaves.
No other plants will be harmed.
 
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