Princep Liquid Herbicide

$79.95

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4.5 Rating: 4.5

2 Reviews | 18 Q&A 

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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, when used as directed on label
Formulation: Professional Product
Group 5 Herbicide
Manufactured By: Syngenta



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

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4.5 star rating (2 reviews)

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  • 2 of 2 people found this review helpful:

    5 of 5 Stars  Princep
    By Paul in Soledad, CA on November 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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  • 4 of 5 Stars  Princep Liquid
    By Frank in gilbert on January 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

March 22, 2013 Don from Fort Worth Texas asked:

QHow do I mix Princep with water (per gallon) to spray my lawn? I will use a one gallon sprayer.
I ordered 2 1/2 gallons and the directions are just for farm spraying.

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.

17 of 23 people found this answer helpful.
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March 28, 2013 Dave from Rochester, In asked:

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

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

14 of 14 people found this answer helpful.
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April 29, 2013 Lee from Marietta Ga asked:

QMixing Princep for lawn use?
I followed the 1 oz per 1000 sq feet and it did not touch the weeds in my yard. Can you please help me figure the proper mixture?

APrincep 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.

6 of 8 people found this answer helpful.
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July 11, 2013 Martin from Alma, Ar asked:

QWhich pre-emergent to 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?

ABoth the Princep and Dimension 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.

4 of 4 people found this answer helpful.
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April 21, 2013 Daniel from Wausau asked:

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

AIf 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.

4 of 4 people found this answer helpful.
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Most Recent Customer Questions

April 10, 2015 Kirk from Memphis,tn asked:

QWhat can I use now for getting rid of poa annua?

A Princep Liquid Fertilizer is labeled to be used on poa annua (annual bluegrass). Please be sure the check the label for the tolerant lawns.

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March 14, 2015 Bryce from Jamesville,nc asked:

QWhen is the best time to spray Princep for crabgrass and other summer weeds 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 Mast Gardener for recommended application timing. You can find your Master Gardeners contact information by clicking the link provided below.

http://www.csrees.usda.gov/

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January 12, 2015 Frank from Gilbert,az asked:

QWhat is proper ratio of Princep 2.5 gal liquid to water in hose end 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 but pre-emergent herbicides are really not recommended to be applied using a hose end sprayer.

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

1 of 2 people found this answer helpful.
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November 7, 2014 Greg from Chattanooga,tn asked:

QWhat color is it after mixing?

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

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October 25, 2014 Paul from Soledad, Ca asked:

QI just want to prevent weeds from growing along my driveway, what rate should I use?
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.

1 of 2 people found this answer helpful.
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October 23, 2014 Mary from Rio Rico, Az asked:

QCan I apply PrincepLiquid 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 actually is recommended to not use a hose end sprayer with Princep 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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September 20, 2014 Larry from Longwood Florida asked:

QSurfactants are not to be used with Princep but can you use a marker dye?

A You can add a dye indicator such as Turf Mark Blue to Princep Liquid Herbicide.

1 of 1 people found this answer helpful.
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August 27, 2014 Lisa from Glenmora, La asked:

QHow long will each application of Princep Liquid Herbicide last for?
How long will it last before I have to re-apply to control the weeds?

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.

1 of 1 people found this answer helpful.
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July 21, 2014 Trhoton from Nickelsville, Va asked:

QCan Princep be mixed with Round Up? How long will weeds be prevented with Princep?

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.

 

 

We do not recommend applying RoundUp to the area because it is a non-selective herbicide that will eradicate anything that is sprayed with the product. Including the desired vegetation.

1 of 2 people found this answer helpful.
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June 18, 2014 Tim from Lagrange Ga. asked:

QI have a weed called Knawel(sandspur). Which pre emergent do I need ?

A Princep is a pre-emergent that we carry labeled for knawel which is listed as german moss.

Surflan is our popular pre-emergent for sandburs/spurs if that is more what you are treating for.

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