Princep Liquid Herbicide


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Princep Liquid Herbicide jug(s) (2.5 gallons)

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Buy 2 or more: $77.23 each

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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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March 22, 2013Don 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.


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.

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March 28, 2013Dave 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.

8 of 8 people found this answer helpful.
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April 29, 2013Lee 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, 2013Martin 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, 2013Daniel 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.

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April 10, 2014Don asked:

QCan I tank mix Trimec 992 with Princept Liquid?

AWe 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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May 23, 2014Tim 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.

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

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