Question about Roundup "" Weed & Grass Killer

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I have treated the area with roundup for about a 70% kill rate. A friend just mowed over the area. Will this impact the ongoing kill, and do I need to spray the area again?

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When was the field mowed after spraying? If it was after three days, then the plants that were treated will die off. You probably should plan to retreat the areas that weren't killed after those plants are growing again. (It will take a few days depending on moisture and other conditions.)

In general, you can spray any missed plants 7 days after the first treatment. Then mow or seed the area 3 days after the second treatment.

If the field was mowed prior to the three days after the first treatment, retreat the entire area after the new growth begins.

For specific details, read the label for your Roundup product. Scotts has the label at the bottom of their product pages. All of the Scotts Roundup products are listed here:;jsessionid=64F09279DC15FE8877450FE65C85C38E?itemId=cat50096&navAction=jump . Select the specific one you used and click on the View Product details link. Then click on the View Label link. For example the label for the Roundup RTU (ready to use) Pump and Go Spray formulation is here: .

I hope this helps.

Cindy Wells

Posted on May 23, 2011


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Could the mixing of roundup and urea have an effect on the crops grown in areas treated with this mixture?

yes since roundup is a non selective herbicide... why would you mix with urea considering it is usually sulfur coated slow release in fertilizer

Apr 04, 2012 | Aqua Garden


A convenient way to kill individual weeds in your lawn

I purchase full strength roundup from places that sell fertilizers etc to farmers. I mix my own roundup per their recommendations plus a little. I fill a small eye drops bottle with my mixed roundup. I like this bottle because it has a small opening so I can squeeze out a drop at a time.. I carry the bottle of mixed roundup in my pocket, with the lid shut tight of course, and as I mow and I spot a weed I take out the bottle and place on or two drops on that weed. One drop of roundup on a leaf of a plant will kill it but I try to place one or two drops right in the middle of the plant. Roundup is fed to the root of the plant from the leaf kills the weed from the roots up. This works well because I can kill the weed without killing grass or other plants around it. Wind will not effect it because the roundup is place on the plant not sprayed on it. Roundup needs about 12 hours to work so do not water right away. Ready mixed roundup from a store may work, I have not tried it because I want to be sure the mixture is strong enough to do the job. About 4 ounces per gallon of water is recommended, I increase that to about 6 ounces. Works great.

on Apr 16, 2010 | Garden

3 Answers

How soon can weeds be mowed or watered after application of roundup?

Depends a littlebit on what tpe of weed but normally 24 hours after application on an actively growing weed is enough for it to be taken into the plant

Aug 03, 2011 | Roundup "" Weed & Grass Killer

1 Answer

I have a bottle of concentrated "Roundup", but

Roundup concentrate is normally mixed at the rate of 1 to 50 or 2%. This should kill most weeds and you can treat hard to kill weeds with a second application. 2% works out at about 3 fluid ounces per gallon. For an imperial or UK gallon you would need 90mL or 75 mL in a US gallon. You will probably find a bottle or can around the house which has this capacity and cut the top off it to use as a measure.

Jul 18, 2011 | Roundup "" Weed & Grass Killer

1 Answer

How much round up PRO do you mix per gallon of water

It depends on the amount of active ingredient you need to kill the plants in your property. The rate is dependent on the size of the plants. For a final concentration of 1/2% (plants under 6" in height - do not mow them short the day before spraying), you need 2/3 oz of Roundup Pro (not the Roundup Pro Concentrate). However, if your area has perennials that are larger (stressed or 1-2 feet tall), you might need 2% Roundup, and then you need 2 and 2/3 oz of Roundup Pro.

Please read the label for your product and identify the plants in your location to get the appropriate rate.

Many Monsanto product labels are available as PDFs here: .

Do not mow or disturb the plants for three days after spraying. You may need to apply the Roundup in 7 days to get any plants that you missed (or weren't affected by the first dose). Wait another 3 days after the second application before planting in the area.

I hope this helps.

Cindy Wells

Apr 23, 2011 | Roundup "" Weed & Grass Killer

1 Answer

I have used Roundup weed killer in the past, and am satisfied. But I no longer have the instructions about how much product to mix per gallon (or quart) of water. I use small amounts, like a quart sprayer....

I have a 5ltr can of Roundup and the dilution ratio for general week killing is 1 part Roundup to 4 parts water. I use this ratio all the time and it workes a treat.

Mar 10, 2011 | Garden

2 Answers

How long do I need to wait to reseed / sod lawn after applying roundup?

If you use Roundup or equivalent (do not use the long-acting product with a pre-emergent). Then you can reseed three days after the treatment. Do check the label for your specific product for any directions that differ for the reseeding schedule.

Some specific treatment limits: First some lawns will require two treatments with Roundup before reseeding (or planting sod). So wait 7 days after the first application to identify any green (growing) spots and then retreat. After all existing lawn grasses and weeds have been treated, you can rake the area and then put down sod or grass seed 3 days after application.

Second: for best results the plants treated with Roundup need to get rain or irrigation a few days before the application and 2-3 days after the application. (This is true if the soil is dry when you are getting ready to plant.)

I hope this helps.

Cindy Wells
(the labels for several Roundup products are here: . Click on product information and then the label.)

Oct 25, 2010 | Roundup "" Weed & Grass Killer

1 Answer

How much do I water after the roundup is applied

Roundup (glyphosphate) doesn't get watered in. However if the area was stressed due to heat or dry conditions, water before using the Roundup to ensure that the plants are growing and transporting nutrients to the roots. The usual recommendation is 1" per week. Roundup kills all plants that it is in contact with. Then let the product dry before it rains (1-4 hours depending on the formulation read the label for rain-fastness information).

Water the plants that were not sprayed as you normally would as long as the treated areas will not be wetted before the Roundup is dry.

Even the extended control version does not need to be watered in.

If you are using a different product that needs to watered in, please read the label for directions. (For example some pre-emergents need to be followed 1" of rain to water them. Alternatively you can do a shallow tillage of the treated ground (2" deep iirc).)

I hope this helps.

Cindy Wells
(any directions given in the product label should be followed)

Sep 13, 2010 | Garden

1 Answer

I will be applying Roundup to a large section of my lawn to kill a bermudagrass infestation. Will the Roundup work better on longer grass or a freshly mowed lawn?

Round up will work on any grass...I prefer to mix it a bit stronger when I know I am trying to kill grass... but yes it works... ask my daughter who wanted to help and spray the weeds for me and then decides to play around in the yard writing her name....:-)
It can take a week for a full killl though...


Aug 12, 2010 | Roundup "" Weed & Grass Killer

1 Answer

Agriculture Application of Round-up

Very important to buffer the pH of the water at pH 5. Then add Roundup /Glyphosate 360 at a 2% for grass weeds and 3% for brush weeds. Ensure that the grass is dry when treating and no rain is expected within 6 hours. Please take care with roundup as it is poison .

Apr 22, 2010 | Roundup "" Weed & Grass Killer

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