Any gly I've sprayed takes 2 weeks

 

I have started using that stuff they sell at TSC, if you have one.. Groundwork brand. Works pretty good, but as stated, it's not instant. It's only temporary too, and it's better to spray when the foliage is there to suck it up, then come back the next week and weed-eat the leftovers.

The plant has to suck it in.

For quick weed treatment you can do the vinegar and soap trick, but it has to be sunny, and it won't last near as long as roundup.

 

So same with the grass? I was just trying to make sure my mixture was good and tested it on the grass by the side of the garage. Its still green too.

 

Two Months ago I started mixing Roundup Pro Max to a 5% solution (something like 5.5oz concentrate per gallon), and I've been seeing wilt by the end of the day and dead (and gone) plants by next weekly service. I also have been mixing Prodamine Pre-Emergent with the Roundup, and have seen no new growth in treated areas (I'm using it for beds, hardscapes, and some fence lines) in the last 6 weeks - the Horizon chem guy who sold me on this said I should get 4 months out of this solution... Sure will be awesome if it holds!

 

I can assure you mixing at 5.5 per gallon won't kill them any deader. Label says 2oz per k. Why waste your money. Go label rate mix with scythe if you want quick results. At 5.5 you are already spending the money.

 

So maybe I should up my percentage a little?

 

2 oz per gallon is fine for most weeds/grasses, straight glyphosate takes 1 to 2 weeks to kill completely depending on how fast what you sprayed is growing ( takes longer in winter for instance) .

 

how many oz per gal did you use? rounpup quik pro (blue jug sold by weight as it's a small gran to be mixed with water) is what a lot of guy use if you want a faster kill. if you bought r-up pro liq it will take longer, there are different mix rates but a slow kill is usually better. mixing too heavy might achieve a fast burn off without killing the weed, it will grow back

 

The kill is being affected by the weather in my opinion. The weeds or grass have to be actively growing in order for it to work properly. The lack of rain and hot weather here in Illinois has caused round up to slow down.

 

I would give a higher concentration a shot, it has worked well for me down here in the Houston area, where 1.7% has not worked (in June, after 2 weeks...). The label of Roundup Pro-Max specifically states, concerning annual and perennial weeds, to run 4-7% when using directed spot spray equipment (such as hand or backpack sprayer....) On balance, the label also says to run 0.7 to 1.5% when using high volume spray to wet - this is more of an agricultural boom spray setup..

 

Monsanto had an ad campaign a bunch of years ago, showing weeds dead in 24 hours after being sprayed. Not true at all. Takes at least a week, more like 2 as others have mentioned. So, they came out with Quik Pro. Quik Pro will kill fast, because of the Diquat in it. But diquat is an old nasty chemical, and I don't like to use it. It's also in a dispersable granule form, which are a pain to mix. You really have to agitate the stuff.

Also, weeds have to be actively growing in order for gly to work. If they're shriveled and half dead already, it just ain't gonna work!

Also also, they die as fast as they grow. If it gets cold, or really dry, and the weeds sorta shut down for a bit but are still green, gly will take longer to work.

Now, for regular little stuff, 2 oz/gallon is fine. For big stuff, vines, 3' tall weeds, etc., go heavier. You can go as high as 12.8oz/gallon and still be on label.

My UDK mix (Ultimate Death Kill) of 8 oz of 41% gly and 2 oz of Three Way Ester II has never failed me.

But, if you're just spraying gly, just be patient.

 

Yep, with plain gly, I would not want to see results in much under a week. If it's not dead in 2 weeks, then yeah, you did something wrong.

One thing to consider is that it takes time for the gly to migrate from the leaves down to the roots. If you burn the plant down in 48 hours, the gly will never get to the roots, and it will come back as strong as ever shortly.