Rain after an application of Princep Liquid Herbicide is okay. According to the product label, this product should be watered in with either rainfall or irrigation within 10 days of application.
Princep Liquid Herbicide is not labeled to be used on granite drives or like areas so would not be recommended. Surflan would be a better option.
Princep Liquid Herbicide is labeled to be used on Christmas tree plantings and in nurseries. One 2.5 gallon jug of can cover 5-10 acres depending on the usage (1-2 qt per acre) rate needed for your use. The product will not kill existing weeds.
Princep Liquid Herbicide is not labeled to be used in residential landscapes. It would only be used as a tank mix with another product in commercial landscapes per the product label.
Pre-emergent weed products like Princep usually need to be applied when soil temperatures are lower than 55-65 degrees Fahrenheit to be effective against weed germination. After the weed seeds have warmed up, they germinate, rendering pre-emergent applications useless. There is not a specific temperature but if it gets close to 85-90 degrees it is possible that those seeds have already germinated.
Please view our Warm Season Lawn Care Schedule for general timing recommendations or contact the Master Gardener with the County Extension Office for specific timing in your area.
No, Pricep Liquid Herbicide is not labeled for Virginia Buttonweed. We have found that EndRun works great to treat VA Buttonweed when applied per label. Blindside is labeled to suppress VA Buttonweed.
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.
You will need to use 0.75-1.5 oz. of Princep Liquid Herbicide per 1,000 sq. ft. depending on your target weed(s).
Princep Liquid Herbicide is the same as Princep 4L.
Princep Liquid Herbicide is listed by the state of California as a restricted product and this we cannot ship it to that state. Tenacity is a similar product you may be interested in that can be shipped to California.
Princep Liquid Herbicide can be used at a rate of 0.73 to 1.46 oz per 1000 sq ft in a sufficient volume of water to cover 1000 sq ft. Water is only acting as the carrier therefore you need to know how much water it takes to cover 1000 sq ft and use this amount of water to mix the 0.73 to 1.46 oz of Princep Liquid Herbicide.
Please view the product label for the list of target weeds to confirm this herbicide will be effective for your treatment.
Princep Liquid Herbicide is a pre-emergent herbicide that will not target actively growing weeds. Crew would be a great product to use for pre-emergent control of listed weeds. Contains dithiopyr and isoxaben as its two active ingredients. Research from several extension pages do suggest the use of Atrazine for this weed, but we are not able to guarantee its effectiveness as the product is not labeled specifically for this weed. Atrazine is labeled for use only on St Augustine and Centipede established turfgrasses. Also, keep in mind given how persistent and pesky chamberbitter is, there is no one and done solution to take care of the weed so repeat applications may be necessary.
A hose end spray is not recommended for applying Princep Liquid Herbicide or any other herbicide as these sprayers make it difficult to measure the volume of water that it puts out. When applying fungicides and herbicides, it is important that a sufficient volume of water is being used to adequately cover each 1000 sq ft as water is only acting as a carrier to distribute the active ingreident. Using too much of the active ingredient in not enough water, you risk damaging your lawn, use too little and you will not get adequate results.
View our How to Calibrate Your Sprayer Video for a quick tutorial on how to do this process.
Princep Liquid Herbicide is applied at 0.75-1.5 fl. oz./1,000 sq. ft depending on your turfgrass type and program you are following. Please refer to the product label for complete instructions.Because timing varies from region to region, we suggest contacting your county extension office for information on timing in your area.
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.
Yes, Princep Liquid Herbicide is labeled to control annual weeds such as Russian Thistle prior to germination. It can be applied to established warm season turfgrass only as directed.
Per the Princep Liquid Herbicide label, this pesticide is toxic to aquatic invertebrates. Do not apply directly to water, to areas where surface water is present, or to intertidal areas below the mean high water mark. Runoff and drift from treated areas may be hazardous to aquatic organisms in neighboring areas. Do not contaminate water when disposing of equipment washwater.
Princep Liquid Herbicide is not labeled specifically for switchgrass.
According to the product label, Princep Liquid Herbicide is not labeled to be used on pastures where livestock will graze or free range animals are present. 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 used in pastures.
