Princep Liquid Herbicide

$108.45

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4.5 out of 5 stars Rating: 4.7

3 Reviews | 21 Q&A

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{ $108.45 { $91.48
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Princep Liquid Herbicide jug(s) (2.5 gallons)

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Princep Liquid Herbicide

Princep Liquid Herbicide works as a pre-emergent herbicide to kill a variety of grass and broadleaf weeds such as crabgrass, groundsel, goosegrass, and many more (see label for complete details). Use Princep Liquid Herbicide before weeds emerge or after already emerged weeds have been removed. With a variety of use sites Princep Liquid Herbicide is a versatile product that can be used on commercial and residential turf (Warm Season grasses only), golf courses, landscapes, nurseries, Christmas trees, ornamentals, shelter belts, and sod farms (only in Florida).


Active Ingredient: Simazine - 41.9%
Target pests: A wide variety of annual broadleaf and grass weeds, including crabgrass, goosegrass and groundsel and many others
* See label for complete list
For use in: Golf courses, residential and commerical lawns (Warm Season grasses only), nurseries, landscapes and ornamental plantings, Christmas tree plantings, sod farms (Florida only), and shelter belts
* See label for complete list
Application: * See label for complete application instructions
Pet safe: Yes, if used as directed on label
Formulation: Professional Product
Group 5 Herbicide
Manufactured By: Syngenta


When tank mixing or sequentially applying simazine or products containing simazine, the total pounds of simazine applied must not exceed the specific maximum rate per calendar year as noted in the use directions.

Apply Princep Liquid before weeds emerge or after removal of weed growth. Princep Liquid controls a wide variety of annual broadleaf and grass weeds when used at selective rates in turf and ornamental plantings.

Where a range of application rates is given, use the low rate on coarse-textured soil and soil lower in organic matter; use the high rate on fine-textured soil and soil higher in organic matter.

Since Princep Liquid enters weeds mainly through their roots, moisture is needed to move it into the root zone. Very dry soil conditions following application may necessitate shallow cultivation or rotary hoeing.

  • For use in a broad range of areas
  • Controls a wide variety of broadleaf and grass weeds

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Average Customer Rating
4.5 out of 5 stars (3)

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  • 4 of 7 people found this review helpful:

    5 of 5 stars  Princep
    By Paul in Soledad, CA on 11/15/2014
    Verified Purchase

    I use this with a hand sprayer to keep weeds from my driveway and fences. This liquid product is a lot easier to use than the dry product I have used in the past. I have not tried it in my lawn yet

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  • 2 of 3 people found this review helpful:

    5 of 5 stars  Very Effective
    By Tom in Pierson, Florida on 08/21/2015

    I have used Princep in every form available for over 25 years because it works and the product I bought here is equally effective. Great for parking lot cracks, fence lines and areas where no growth is wanted. Using the highest labeled rate works fine in these places.

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  • 1 of 4 people found this review helpful:

    4 of 5 stars  Princep Liquid
    By Frank in gilbert on 01/25/2015
    Verified Purchase

    Very easy to apply. Hopefully it will work as well or better that the Princep powder that I used previously

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Most Helpful Q&A's

03/22/2013 Don from Fort Worth, Tx

QHow do I mix Princep Liquid Herbicide with water (per gallon) to spray my lawn? I will use a one gallon sprayer.

A

You will need to use 0.75-1.5 fl. oz./1,000 sq. ft depending on your target weed. Most folks use the higher usage rate.

The first thing you need to know when using an herbicide such as Princep Herbicide is that the exact amount of water you dilute it with is not important. It is only important to make sure you are using the correct amount of product per 1,000 sq ft of lawn. Use too much and you risk damaging your lawn, use too little and you will not get adequate results. You will need to use 0.75-1.5 fl. oz per 1,000 sq ft . To decide how much water you want to use, you should mark a 1,000 sq ft area, fill your sprayer with WATER ONLY, and start walking and spraying just as if you were doing the actual application of herbicide. When you are done walking and spraying the 1,000 sq ft area note how much water it took you to spray that area, and that is the amount you will want to mix 0.75-1.5 fl. oz of product with for each 1,000 sq ft area that needs to be treated.

24 of 32 people found this answer helpful.
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03/28/2013 Dave from Rochester, In

QWhat is the coverage area that one jug of Princep Liquid Herbicide will treat?

A

One 2.5 gallon jug of Princep Liquid Herbicide can cover 5-10 acres depending on the usage (1-2 qt per acre) rate needed for your use.

19 of 20 people found this answer helpful.
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04/29/2013 Lee from Marietta Ga

QWhat is the proper mixture for Princep Liquid Herbicide?
I followed the 1 oz per 1000 sq feet and it did not touch the weeds in my yard.

A

Princep Liquid Herbicide is a pre-emergent weed control product and it will not control the weeds that have already emerged in your yard. According to the Princep product label: Apply Princep Liquid after September 1 (after October 1 for annual bluegrass) before emergence of winter annual weeds. Fall applications of Princep Liquid will control annual bluegrass, burclover, lawn burweed, common and mouseear chickweed, corn speedwell, henbit, hop clover, spurweed, and parsley-piert. Princep Liquid will also control these weeds soon after emergence. For control of summer annual weeds listed in the Product Information section of this label, apply Princep Liquid in late winter before the weeds emerge. Apply in a minimum of 15 gallons of water per acre. Irrigate with 1/2 inch of water if rainfall does not occur within 10 days after preemergence treatment. Where annual bluegrass is the major weed, use 1 qt. of Princep Liquid per acre (22 ml or 0.75 fl. oz./1,000 sq. ft.). Use 1-2 qt./A Princep Liquid (22-44 ml or 0.75-1.5 fl. oz./1,000 sq. ft.) for control of other weeds. However, do not exceed 1 qt./A of Princep Liquid per treatment on newly sprigged turfgrass or on hybrid bermudagrass.
For control of summer annuals which emerge after the initial application, apply an additional 1 qt./A Princep Liquid at least 30 days after the initial application, but not after June 1. However, do not make more than 2 applications per year.

13 of 15 people found this answer helpful.
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07/11/2013 Martin from Alma, Ar

QWhich pre-emergent can you mix with Princep (simazine)?
I have used Dimension with moderate results. If I switch to simazine, how best to augment it (if at all) for a mix of grassy weeds and broadleafs, including Crown Vetch and Henbit?

A

Both Princep Liquid Herbicide and Dimension 2EW have henbit and many other weeds and grasses on the label for control so either would work well for your needs. We do not recommend mixing the two together as it would not give you any extra control. We contacted several of our experts in the herbicide field and reps at the manufacturers of the products we carry and they all came to use with the same answer. There are no pre-emergent herbicides that will control Crown Vetch. The only way to control it is post-emergent form or by taking the area to bare ground and reseeding with which ever grass you choose. We apologize we could not be of more help for your situation but some weeds like Crown Vetch and also Nutsedge just cannot be controlled prior to germination. Please let us know if you have any other questions.

7 of 7 people found this answer helpful.
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04/21/2013 Daniel from Wausau

QHow long will Princep Liquid Herbicide stay in the soil?
It was applied to an area last spring and would like to place a few plants in the same area.

A

If Princep was applied a year ago, you should be fine to plant or seed the area now. Generally, you would wait between 4-6 months.

7 of 7 people found this answer helpful.
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Most Recent Customer Questions

02/01/2016 Bill

QCan I use a sprayer attached to a water hose to apply Princep Liquid Herbicide??

A

You may apply Princep†with a hose end sprayer. Our concern is that the application will not as accurate as it would with a pump sprayer.†

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01/26/2016 Jerry from Granbury, Texas

QHow would you recommend that I apply Princep Liquid Herbicide with a 21 gallon lawn mower pulled sprayer?
How would you mix it? I have about 2/3 acre to spray. I would like to mix it with a liquid fertilizer. Do you have recommendations for that also?

A

The application rate for Princep Liquid Herbicide will vary from 1-5 pints in a minimum of 20 gallons of water per Acre, depending on where you are applying it. For all application directions and restrictions, see the section "Application Procedures" on page 7 of the product label. It is always most important to use the correct amount of product applied evenly over the area; the exact amount of water will vary depending on your equipment and speed of application. If you plan on mixing other chemicals with Princep, then you will need to do a compatibility test and then calibrate your mixture according to the section "Mixing Procedures" on page 8. We generally do not make recommendations on fertilizers since the needs of your turf will vary. You can browse all our Liquid Fertilizers here.

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08/23/2015 Jim from Redding, Ca

QIs Princep Liquid Herbicide available in California?

A

Princep Liquid Herbicide is a professional grade product and not sold retail. We can ship it to you with our Fast Free Shipping!

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07/21/2015 Bill from Memphis, Tn

QWhat fertilizer could we add to our tank to fertilize our Bermuda and Zoysia lawn while we apply Princep Liquid Herbicide as a pre-emergent?

A

Princep Liquid Herbicide can be mixed with any of the liquid fertilizers found here. †Which you choose would depend on what nutrients your lawn is lacking at the time of application. †We recommend to contact your cooperative extension office and speak with the Master Gardener on duty. The Master Gardener will be able to assist you with a soil analysis.

1 of 1 people found this answer helpful.
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03/14/2015 Bryce from Jamesville,nc

QWhen is the best time to spray Princep Liquid Herbicide for crabgrass and other summer weed control?

A

Princep Liquid Herbicide works as a pre-emergent herbicide so application timing is crucial and varies from region to region and current weather conditions. We would recommend contacting your local Master Gardener for recommended application timing.

1 of 2 people found this answer helpful.
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11/07/2014 Greg from Chattanooga, Tn

QWhat color is Princep Liquid Herbicide after mixing?

A

The Princep Liquid Herbicide will be a light tan color once mixed with water.

1 of 1 people found this answer helpful.
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10/25/2014 Paul from Soledad, Ca

QI just want to prevent weeds from growing along my driveway, what rate should I use the Princep Liquid Herbicide?
I will be planting some evergreen trees there in the future.

A

You will need to use 0.75-1.5 fl. oz./1,000 sq. ft depending on your target weed.

The first thing you need to know when using an herbicide such as Princep Herbicide is that the exact amount of water you dilute it with is not important. It is only important to make sure you are using the correct amount of product per 1,000 sq ft of lawn. Use too much and you risk damaging your lawn, use too little and you will not get adequate results. You will need to use 0.75-1.5 fl. oz per 1,000 sq ft . To decide how much water you want to use, you should mark a 1,000 sq ft area, fill your sprayer with WATER ONLY, and start walking and spraying just as if you were doing the actual application of herbicide. When you are done walking and spraying the 1,000 sq ft area note how much water it took you to spray that area, and that is the amount you will want to mix 0.75-1.5 fl. oz of product with for each 1,000 sq ft area that needs to be treated.

3 of 4 people found this answer helpful.
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10/23/2014 Mary from Rio Rico, Az

QCan I apply Princep Liquid Herbicide with a 4 gallon back-pack sprayer or do I have to use hose end sprayer?
I tried it with the hose end sprayer and it was difficult, so was wondering about a battery back-pack sprayer.

A

Yes, it not actually recommended to use a hose end sprayer with Princep Liquid Herbicide or any other herbicide as they are no where near as accurate for application or even as a backpack sprayer. Using a backpack sprayer like you mentioned would be the ideal form of application and just follow the product label instructions for mixing.†

1 of 1 people found this answer helpful.
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09/20/2014 Larry from Longwood, Fl

QCan you use a marker dye mixed with Princep Liquid Herbicide?

A

Yes, you can add a dye indicator such as Turf Mark Blue to Princep Liquid Herbicide.

4 of 4 people found this answer helpful.
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08/27/2014 Lisa from Glenmora, La

QHow long will each application of Princep Liquid Herbicide last for?

A

Princep Liquid Herbicide is a pre-emergent that will prevent weeds from germinating in the soil and will last about 4-6 months in the soil.† It will not kill any actively growing weeds.† Timing is always key when applying pre-emergents and will vary by region and the best person to ask about application timing is your local master gardener who works at your local cooperative extension office.

3 of 3 people found this answer helpful.
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See all 21 questions »


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