Princep Liquid Herbicide

$79.95

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Princep Liquid Herbicide jug(s) (2.5 gallons)

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$79.95
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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, 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, nurseries, landscapes and ornamental plantings, Christmas tree plantings, sod farms (Florida only), and shelter belts. See label for complete list.
Pet safe: Yes, when used as directed.
Manufactured By: Syngenta



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

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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.

15 of 18 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.

9 of 9 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.

5 of 6 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.

3 of 3 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.

3 of 3 people found this answer helpful.
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Most Recent Customer Questions

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.

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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. 

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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.

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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.

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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.

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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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June 10, 2014 Jim from Jackson Mi asked:

QIs Princep used with blueberries?
What is your recommendation for blueberries?

A

Princep Liquid Herbicide works as a pre-emergent herbicide to kill a variety of grass and broadleaf weeds. It is not labeled for blueberries. Can you tell us more about what you are treating for on or around blueberries so that we can offer you another product that will be effective?

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May 23, 2014 Tim from Signal Mountain, Tn asked:

QCan I use Princep under Hickory and various mature oak trees?
I am landscaping an area containing mature oak and hickory trees and would like to use Princep to prevent week growth under these trees and then use a mulch to cover the entire root areas.

A Yes, Princep can be used under mature trees and should pose no harm to them

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April 10, 2014 Don asked:

QCan I tank mix Trimec 992 with Princept Liquid?

A We do not recommend mixing Trimec 992 and Princept, because they had different modes on action. You want to apply the Trimec earlier in the season and then when/if other weeds start groing  you can apply Princept. Be sure that your type of turf is labeled for application of both products.

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