The Princep Liquid Herbicide will be a light tan color once mixed with water.
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.
Per the product label, St. Augustinegrass, Bermudagrass, Centipedegrass, and Zoysiagrass species can experience yellowing after application of Princep Liquid Herbicide under certain circumstances.
The product label suggests the following reasons to help avoid turf injury: (1) Use only on turfgrass reasonably free of infestations of insects, nematodes, and diseases. (2) Do not use north of NC (except in the VA Coastal Plains) or on soils with a pH above 7.8. (3) Do not use on muck or alkaline soils. (4) Do not apply over the rooting area of trees or ornamentals not listed on this label. (5) Do not seed or overseed with desirable turfgrass within 4 months before or 6 months after treatment. (6) Do not apply this product to newly seeded grasses until they have overwintered and have a well-developed rhizome system. (7) Do not exceed 2 qt/A of Princep Liquid within 12 months of seeding grasses.
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 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.
Princep Liquid Herbicide is the same as Princep 4L.
Princep Liquid Herbicide states on the product label: Do not seed or overseed with desirable turfgrass within 4 months before application. So you will need to wait at least 4 months after seeding to apply the product.
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.
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.
Princep Liquid Herbicide is labeled for use around a few specific woody ornamental plants and conifer plantings. However, it is not safe for use around other ornamental plants or cacti. It is important to prevent any drift of this product from getting into non-target areas, as it can contaminate water or harm non-target plants.
Princep Liquid Herbicide is a pre-emergent that is safe to use on established turfgrass and ornamentals per the product label. If there were to be damage to existing plants, or shrubs 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.
We would not advise applying a pre-emergent such as Princep Liquid Herbicide in the same season you plan on seeding anything. It may inhibit the growth of seeds It is also not labeled to be applied around sunflowers.
Princep Liquid Herbicide and Ranger Pro have different modes of action. Pre-emergents should be applied prior to weed germination and post-emergent herbicides should be applied when weeds are young and actively growing. If you plan on mixing other chemicals with Princep, then you will need to do a compatibility test and then calibrate your mixture according to the section "Mixing Procedures" on page 8 of 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.
For established turfgrasses, you should not mow 2 days before or 2 days after applying Princep Liquid Herbicide.
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.
Princep Liquid Herbicide is not labeled specifically for switchgrass.
