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.
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.
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.
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.
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.
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 preemergent 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 turf grass or on hybrid Bermuda.
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.
Yes, you can add a dye indicator such as Turf Mark Blue to Princep Liquid Herbicide.
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.
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.
Princep Liquid Herbicide can be mixed with any of the liquid fertilizers found here. Which you choose would depend on what nutrients your lawn is lacking at the time of application. We recommend to contact your cooperative extension office and speak with the Master Gardener on duty. The Master Gardener will be able to assist you with a soil analysis.
Princep Liquid Herbicide is a pre-emergent that we carry labeled for knawel which is listed as german moss. Surflan is our most popular pre-emergent for sandburs/spurs if that is more what you are treating for.
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.
A surfactant is not recommended for use with Princep. Per the product label: “Do not apply in combination with surfactants or other spray additives..”
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.
You may apply Princep with a hose end sprayer. Our concern is that the application will not as accurate as it would with a pump sprayer.
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.
The mixing ratio for Princep Liquid Herbicide is 0.75-1.5 fl. oz. per gallon of water.
Dogs are safe to return to areas treated with Princep Liquid Herbicide after the area has dried completely, typically a few hours.
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.
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.
