Princep Liquid Herbicide can be tank mixed with Prodiamine 65 WDG for a more broad spectrum pre emergent application provided a Compatibility Test is ensure they are physically compatible. With Prodiamine 65 WDG being a wettable dispersable granule, we recommend mixing it in first allowing it to dissolve first before adding the liquid pre-emergent and/or using an agitator in your tank.
Princep and Prodiamine are labeled for henbit however do not list hairy bittercress as a weed it will control. Gallery herbicide would be a better option as the active ingredient isoxaben is labeled for both hair bittercress and henbit. Also, late summer/fall pre emergent applications are going to provide better results than early spring pre emegent applications. Please view the Gallery product label for more information.
Princep Liquid Herbicide is labeled to prevent burclover and hop clover, but not white clover or red clover more commonly found in home lawns.
A pre emergent containing isoxaben such as Gallery DF is labeled to prevent white clover. Please view the product label for more information.
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.
It is necessary to wait at least 4 months after applying Princep to overseed.
According to the product label, the manufacturer does not recommend folks use Princep Herbicide on Zoysia that far north. If you are looking for a pre-emergent for broadleaf weeds that can be used on Zoysiagrass, Surflan Pro would be an excellent option.
Princep Liquid Herbicide works as a pre-emergent herbicide to kill a variety of grass and broadleaf weeds. It is not labeled for blueberries. Can you tell us more about what you are treating for on or around blueberries so that we can offer you another product that will be effective?
Yes, Princep Liquid Herbicide is mixed with water. 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.
Unfortunately, Princep Liquid Herbicide is not labeled to be applied to Kentucky bluegrass and most likely would harm it.
Princep Liquid Herbicide is only labeled for use on warm season grasses not cool season grasses like KGB.
Pre-emergent weed products like Princep usually need to be applied when soil temperatures are lower than 55-65 degrees Fahrenheit. After the weed seeds have warmed up, they germinate, rendering pre-emergent applications useless. If you are past this point, post-emergent weed control applications will need to be used. For the best timing apply pre-emergent in your specific location, we recommend contacting your local cooperative extension office.
We carry Princep Liquid Herbicide, but we do not carry Princep Nine-T. Princep Nine-T appears to be a water dispersible granule that like Princep Liquid Herbicide contains the active ingredient Simazine, at a different percentage. The Princep Nine-T is labeled to be used on fruit crops such as raspberries, apples, and pears while Princep Liquid Herbicide is not labeled for that use.
Princep Liquid Herbicide is a pre-emergent applied to crop and grass areas only. It would not be applied any bodies of water
For established turfgrasses, you should not mow 2 days before or 2 days after applying Princep Liquid Herbicide.
Princep Liquid Herbicide should not be applied to cool season turf. A pre-emergent herbicide such as Pendulum Aqua Cap would help with prevention but will not treat actively growing Japanese Stiltgrass. We would suggest a selective post-emergent such as Acclaim. Acclaim Extra is a selective post-emergence herbicide that controls annual and perennial grasses in turf including Japanese Stiltgrass. Please refer to product label for specific applications to your turfgrass.
Princep is applied at the rate of 0.75-1.5 fl. oz./1,000 sq. ft depending on your target weed. Please see the product label for complete application instructions.
It would not harm to apply Princep Liquid Herbicide as a pre-emergent application as directed on the product label after you apply a post.
Princep Liquid Herbicide is labeled for applications to St. Augustine for sod (Florida only) as well as established turfgrass for fall applications not to exceed two applications per year as directed.
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.
