Roundup (weed killer)

[NuclearNed]

I must be doing it wrong. I have a bottle of the super concentrated stuff. I mixed 2 gallons of it in my sprayer in a higher concentration than the bottle specified, and applied it on a warm windless day. That was this past Saturday. 5 days later there's little if any yellowing, and I don't think I see a single dead weed. Is there some trick?

 

[vi edit]

Last couple times I've applied stuff it took almost two weeks to really start wilting and almost a month to be fully nuked from orbit. But that was pretty decent sized weeds that had really been ignored for too long.

 

[lupi]

Yes. When I use it for the first time of the season the first part of the lawn is usually starting to wilt instead of just yelllowing once I've finished covering it all.

 

[trmiv]

I've found Roundup takes awhile to work, but lasts long. If you're really looking for something to blast the shit out of weeds quickly, try Garden Safe Weed and Grass killer. If it's a warm day, that stuff will nuke the shit out of weeds in like 30 minutes. But they come back quickly. So I go for the c-c-c-c-c-c-c-combo kill!

 

[NuclearNed]

Last couple times I've applied stuff it took almost two weeks to really start wilting and almost a month to be fully nuked from orbit. But that was pretty decent sized weeds that had really been ignored for too long.

That sucks. I want dead weeds and I want them NOW.

 

[JamesV]

That sucks. I want dead weeds and I want them NOW.

It takes about 2 weeks here also; large brick on the ground patio covering nearly a third of the backyard, and weeds grow in all the cracks (small 6"x4" bricks that used to be part of a Hornes department store).

I use Roundup also, but have changed from spraying in the spring when I see all the weeds pop up, to spraying the first day there isn't snow on the ground... some weeds still pop up, but it's alot less than without doing it that way.

 

[Modelworks]

That sucks. I want dead weeds and I want them NOW.

Pour salt on the weeds. Warning , this is a semi-permanent method as nothing will grow in that spot for a very long time.

 

[BoomerD]

One of my instructors at the local community college is also an ag instructor. He told me the trick to making Round-up work right is to mix it a little stronger than the directions call for, and add some liquid dish soap to the mix. I use about 1/8 cup per gallon.

Apparently, the liquid dish soap acts as a wetting agent and also makes the concoction stick to the leaves much better.

I accidentally nuked a piece of my front lawn with the stuff mixed to his directions... and it took more than 2 years to grow back...even though I grabbed the garden hose and tried to wash it off immediately.

BTW, round-up works better in warmer weather when the weeds are actively growing. It still takes a couple of weeks to kill the weed completely.

 

[jagec]

I assume that it was sunny, and you sprayed it on the leaves, not the roots. The first time that I used Roundup, I didn't read the directions and applied it at night. D'oh! That doesn't work at ALL!

 

[Tobolo]

It can take 7-14 days for glyphosate to start to show effects.

BoomerD: RoundUp is mostly surfactant anyway. All you really need to do is mix it a little heavy. Unless you are spraying in a high wind situation you shouldn't need any sticker additive.

 

[BoomerD]

It can take 7-14 days for glyphosate to start to show effects.

BoomerD: RoundUp is mostly surfactant anyway. All you really need to do is mix it a little heavy. Unless you are spraying in a high wind situation you shouldn't need any sticker additive.

That's probably true, but in my experience, adding a bit of dish soap makes it far more effective.

 

[TheNinja]

From what I understand about things like RoundUp is that they just stop the plant from producing chlorophyll (more like borophyll.....amirite?). So it doesn't "kill" them right away, it just slowly starves them. So a hearty plant might survive more than a week on its existing food storage.

 

[RPD]

What type of plants are you spraying it on? I use the extended verision or whatever and in a few hours the weeks are yellow and dying. I don't mix it with anying, just get the pump and go version.

 

[FoBoT]

what temperature has it been? unless it has been 'hot', it'll take 7-10 days

 

[NuclearNed]

what temperature has it been? unless it has been 'hot', it'll take 7-10 days

It was ~70 every day for 3 days after I sprayed on Saturday, but it's been in the 50's the past couple of days.

 

[NuclearNed]

What type of plants are you spraying it on? I use the extended verision or whatever and in a few hours the weeks are yellow and dying. I don't mix it with anying, just get the pump and go version.

I don't know - just generic weeds.

 

[NuclearNed]

From what I understand about things like RoundUp is that they just stop the plant from producing chlorophyll (more like borophyll.....amirite?). So it doesn't "kill" them right away, it just slowly starves them. So a hearty plant might survive more than a week on its existing food storage.

Most likely true. I've used Roundup many times over the years, and I'm always disappointed in it - I think because of their commercials. They seem to make out like weeds will be crispy in 30 mins.

 

[NuclearNed]

One of my instructors at the local community college is also an ag instructor. He told me the trick to making Round-up work right is to mix it a little stronger than the directions call for, and add some liquid dish soap to the mix. I use about 1/8 cup per gallon.

Apparently, the liquid dish soap acts as a wetting agent and also makes the concoction stick to the leaves much better.

I accidentally nuked a piece of my front lawn with the stuff mixed to his directions... and it took more than 2 years to grow back...even though I grabbed the garden hose and tried to wash it off immediately.

BTW, round-up works better in warmer weather when the weeds are actively growing. It still takes a couple of weeks to kill the weed completely.

I'll give this a try the next go-around.

 

[Drako]

Man, I wish my wife would let me use Roundup - I hate weeding .

 

[OutHouse]

same here i sprayed 3 weeks ago and the weeds are finally wilted and yellow. round up is uber expensive, honestly i get better results from the spectracide brand.

the only reason i used it is because my neighbor moved and gave me a big jug of it.

 

[SirStev0]

My parents use it with out problems.

 

[T_Yamamoto]

That sucks. I want dead weeds and I want them NOW.

 

[AmdEmAll]

See if you can get some Trimec and then mix it appropriately with water and some dish soap. Trimec is used by all major lawn care companies.

You are risking nuking your entire lawn using round up.

 

[strep3241]

Temperature also makes a big difference. The hotter it is, the quicker it will work. But even on a hot summer day, it will take a few days for it to start showing signs.

How many ounces did you put in the two gallons? Normally I put 3 ounces per gallon. You don't want to mix it to heavy or you will just burn the tops and not kill the roots.

 

[eldorado99]

I have found there are certain weeds that Roundup will not make a dent in. Pretty rare though.