Princep Liquid Herbicide


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4.5 out of 5 stars Rating: 4.7

3 Reviews | 32 Q&A


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{ $108.45 { $91.48
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Princep Liquid Herbicide jug (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).

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.


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.

31 of 41 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?


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.

24 of 25 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.


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.

18 of 21 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.


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.

12 of 12 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?


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.

10 of 12 people found this answer helpful.
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Most Recent Customer Questions

01/10/2017 Dennis from Birmingham, Al

QIs it OK for rain to fall after applying Princep pre-emergence?


Yes, rain is okay after an application. Per the label for Princep Liquid Herbicide, the product needs to be watered in 1/2 inch no less than 10 days after the product has been applied.

0 of 1 people found this answer helpful.
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11/30/2016 Victor from Gunter, Tx

QHow soon after Princep is sprayed can I allow my livestock to graze?
I have horses and cows grazing on my 11 acres and can move them to different pastures while I spray. How soon before I can put them back on a pasture previously sprayed?


Princep Liquid Herbicide†is not labeld to be used on pastures where livestock will graze. The label states:†Do not graze or feed turf clippings to animals or illegal residues may result. Please see our Range and Pasture Page for products that can be be used in pastures.

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11/04/2016 Ron from Wauchula, Fl

QHow many quarts of dry Princep Herbicide does it take to make a gallon of liquid Princep?


The mixing ratio for Princep Liquid Herbicide is 0.75-1.5 fl. oz. per gallon of water.

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10/19/2016 Brad from Hartsburg, Il

QIs Princep Liquid Herbicide safe to spray through grass waterways when applying at 1qt/Acre in the Fall?


Princep Liquid Herbicide should not be used in aquatic areas or where runoff could enter waterways. Please visit our Aquatic Herbicides page for products that can be use near and in these areas.

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09/15/2016 Rm from Texas

QCan you apply Princep Liquid Herbicide on fescue grass?


Princep Liquid Herbicide is only labeled to be applied to warm season grasses and would not be recommended on fescue.† We do have many other pre-emergent herbicides that could be used instead depending on the type of weeds you are trying to prevent.

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08/08/2016 Peter from Omaha, Ne

QCan this Princep be used to spray under aronia berries?
Also someone said this was organic certified.. I do not see an OMRI cert, is it?


Princep Liquid Herbicide†is not OMRI registered and is not labeled to be used around anything edible. †We apologize but we do not currently carry a product labeled to be used around edible berry plants for pre-emergent weed control.†

1 of 1 people found this answer helpful.
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04/12/2016 Ron from Farmer City, Il

QIs Princep a good choice for crab grass prevention in central IL?
I have a 3 acre yard and am looking for a product to use in a lawn sprayer


Princep Liquid Herbicide†is a very cost effective product to use as a pre emergent for Crabgrass and other listed weeds. Be sure and make the application within 4 weeks of Crabgrass emergence in your area. You can also visit our Lawn Care Guide.†

4 of 4 people found this answer helpful.
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04/05/2016 Paul

QWill Princep Liquid Herbicide kill anything that is planted now?
I sprayed my garden about a month ago, March 1.


Princep Liquid Herbicide is a pre-emergent that is safe to use on established turfgrass and ornamentals on the product label. If there were to be damage to existing plants, then you probably would have already noticed it by now. We always recommend reading the product label completely before applying herbicides to be sure it is safe and appropriate for your desired application. You should not use Princep Herbicide where you have planted or where you are planning to plant edible vegetation. If you are planning to re-seed or overseed an area where you have sprayed Princep Herbicide, then you generally must wait at least 6 months after application before seeding.

3 of 3 people found this answer helpful.
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03/31/2016 Linda from Aledo, Il

QCan Princep Liquid Herbicide be used on an established asparagus bed?


Princep Liquid Herbicide†would not be recommended to be used over Asparagus. You can use a product like Monterey Vegetable and Ornamental Weeder.††Which can safely be used over the top Asparagus.

3 of 3 people found this answer helpful.
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03/16/2016 Robert from Ogilvie, Mn

QIs Princep safe to use on raspberries?


Princep Liquid Herbicide is not labeled to be used around anything edible. †We currently do not have a pre-emergent labeled to be used around raspberries. †We recommend that you contact your local cooperative extension office and ask to speak to the master gardener on staff to receive more information on pre-emergent weed control around edible berries.

3 of 4 people found this answer helpful.
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