Prime Source Quintessential Herbicide

5 out of 5 stars 3 Reviews | 0 Q&A

Prime Source Quintessential Herbicide

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Average Rating

5 out of 5 stars Rating: 5

3 Reviews | 0 Q&A

Product Overview

Quintessential Herbicide is formulated with quinclorac, a Group 4 herbicide, to improve the performance in rainfast situations or drought stress. Efficiently controls crabgrass at all stages including the problematic mid-tiller stage of growth. Enhanced absorption by foliage and roots and transported throughout the plant. Stunted grasses exhibit chlorosis, gradual reddening, and necrosis followed by death. Can be applied post-emergence to residential and commercial establishments, parks, airports, roadsides, schools, and other sites listed on the label. 

Features and Specs

Active Ingredient Dimethylamine Salt of Quinclorac - 18.92%
Target pests Crabgrass, including the mid-tiller stage of growth.
For use in Grounds or Lawns, Golf Courses, Multi-family Dwellings, Military and other institutions, Roadsides, Schools, Cemeteries, and Sod Farms.
Application Apply it to actively growing weeds as post-emergence broadcast or spot sprays using the turf species, rate, and growth stages indicated in the label.
Pet safe Yes, if used as directed on the label.
AR (Restricted To Licensed Applicators Only)
Dimensions 4.00 x 6.00 x 9.00 inches.
Special Features Alters the formulation of quinclorac in a way that improves absorption of the product into the plant.
Shipping Weight 5.00 lbs
Manufacturer Prime Source (Mfg. Number: 51512PS1405)
EPA Registration 89442-57



Applicators and other handlers should:

  • Remove clothing/PPE immediately if pesticide gets inside. Then wash thoroughly and put on clean cloth ing.
  • Remove PPE immediately after handling this product. Wash the outside of the gloves before removing them. As soon as possible, wash thoroughly and change into clean clothing.


Use this product only in accordance with its labeling and with the Worker Protection Standard, 40 CFR Part 170. This standard contains requirements for the protection of agricultural workers on farms, forests, nurseries, and greenhouses, and handlers of agricultural pesticides. It contains requirements for training, decontamination, notification, and emergency assistance. It also contains specific instructions and exceptions pertaining to the statements on this label about personal protective equipment (PPE) and restricted-entry interval. The requirements in this box only apply to uses of this product that are covered by the Worker Protection Standard.
DO NOT enter or allow worker entry into treated areas during the restricted-entry interval (REI) of 12 hours.
PPE required for early entry to treated areas that is permitted under the Worker Protection Standard and that involve contact with anything that has been treated, such as plants, soil, and water, is:

  • Coveralls
  • Chemical-resistant gloves, made of butyl rubber less than or equal to 14 mils, natural rubber less than or equal to 14 mils, neoprene rubber less than or equal to 14 mils, or nitrile rubber less than or equal to 14 mils
  • Shoes plus socks


The requirements in this box apply to uses of this product that are NOT within the scope of the Worker Protection Standard for agricultural pesticides (40 CFR Part 170). The WPS applies when this product is used to produce agricultural plants on farms, nurseries, or greenhouses.

  • DO NOT enter or allow others to enter the treated area until sprays have dried.
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  • 5 of 5 Stars

    Fantastic product!

    By J on 07/05/2023

    Killed all smaller and larger crabgrass in days in early July, no harm whatsoever to surrounding Bermuda.

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  • 5 of 5 Stars

    Works Well!

    By Tom on 08/09/2023

    Spot treated crabgrass in my lawn and three days later the crabbrass is dead and rest of grass is untouched/undamaged. Have tried other products in the past which usually kill the grass along with the crabgrass, but this one is different. Definitely recommend.

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  • 5 of 5 Stars


    By Thomas on 10/15/2023

    Product was spot on in eliminating torpedo grass. DoMyOwn is the best!

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Prime Source Quintessential Herbicide 5 out of 5 stars Rating: 5 (3 Reviews / 0 Q&A)

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