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.
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.
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.
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 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.
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.
It is necessary to wait at least 4 months after applying Princep to overseed.
Princep Liquid Herbicide is a pre-emergent applied to crop and grass areas only. It would not be applied any bodies of water
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.
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.
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 only labeled for use on warm season grasses not cool season grasses like KGB.
Unfortunately, Princep Liquid Herbicide is not labeled to be applied to Kentucky bluegrass and most likely would harm it.
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.
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?
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.
