Q4 Plus Turf Herbicide

$46.25 - $302.50

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4.5 out of 5 stars Rating: 4.7

26 Reviews | 38 Q&A



{ $46.25 { $45.67 $122.50 $119.53 $302.50 $300.00
  Size/Description Price/Ea. Qty
Q4 Plus Turf Herbicide quart (32 oz)

Buy 1: $46.25 each

Buy 2 or more: $45.67 each

Q4 Plus Turf Herbicide - Gallon gallon (128 oz)

Buy 1: $122.50 each

Buy 2 or more: $119.53 each

Q4 Plus Herbicide - 2.5 Gallons jug (2.5 gals)

Buy 1: $302.50 each

Buy 2 or more: $300.00 each

Total Price: $0.00

Availability: Normally ships in 1 business day.
For large order quotes, please call us at 1-866-581-7378.

Q4 Plus Turf Herbicide

Q4 Plus is highly selective on cool-season turf grasses. Labeled species include bluegrasses, ryegrass, tall fescues, and bermudagrass. Q4 Plus herbicide has a CAUTION signal word, a good toxicological profile, is rain-fast in 6 hours and has a 4 week reseeding interval.

  • Convenient post-emergent control of both grassy and broadleaf weeds
  • Crabgrass and foxtail control
  • Yellow nutsedge control
  • Wide window of application for broadleaf weeds
  • Protox inhibitor activity for rapid desiccation and death of broadleaf weeds
  • Fast visual response
  • Highly selective on cool-season turf grasses
  • For use on bluegrass, ryegrass, tall fescue and bermudagrass
  • Rain-fast in 6 hours
  • Suitable for applications up to 90 degrees F
  • Water-based formulation

Rating Snapshot

5 stars   17
4 stars   9
3 stars   0
2 stars   0
1 star   0

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Average Customer Rating
4.5 out of 5 stars (26)

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Most Helpful Customer Reviews
  • 17 of 18 people found this review helpful:

    5 of 5 stars  Great results
    By Kelley in Durham, NC on 03/26/2012
    Verified Purchase

    Very effective on all clover (even hop), and broadleaf weeds in my bermudagrass in NC. I highly recommend this product.

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  • 15 of 15 people found this review helpful:

    5 of 5 stars  Great product
    By Edward on 05/04/2013

    This worked great to kill all the weeds and crabgrass in my 1 acre yard. I used late August of 2012. Used ratio as recommended on label in a 15 gallon tow behind sprayer. I had a little left, so I watered down maybe 1 gallon of the mixture to fill my 15 gallon tank, and it still killed alot of the crabgrass in my neighbors yard. Would buy again.

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  • 9 of 9 people found this review helpful:

    5 of 5 stars  Great Stuff
    By in Indiana on 06/09/2013
    Verified Purchase

    Kind of pricey, but you get what you pay for. Works great on getting rid of weeds, but don't get this stuff close to your flowers or they will be gone as well. I highly recommend this product.

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  • 8 of 9 people found this review helpful:

    5 of 5 stars  It Works when other stuff failed
    By in Atlanta on 08/08/2013
    Verified Purchase

    I would agree with some of the other comments-there is some investment up front-but it's cheaper than hiring someone and it works. I tried other stuff from Lowes and Home Depot with no luck. Used it in hot weather but had little damage to my Bermuda grass. It killed some pretty large patches of crab grass and other weeds. Pay attention to the proper mix. Would buy again

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  • 7 of 7 people found this review helpful:

    4 of 5 stars  Worked Great
    By in Central FL on 07/21/2013
    Verified Purchase

    Q4 worked great for the broadleaf weeds and blanket crabgrass in my bermuda lawn. Didn't damage the bermuda much, even though I sprayed when the temps were hot. It didn't work well on the large-leaf crabgrass, but it completly killed the low-growing blanket crabgrass.

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Most Recent Customer Reviews
  • 5 of 5 stars  Great
    By Dan in Spotsylvania on 10/07/2016

    Exactly as promised and on time

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  • 5 of 5 stars  Very Satisfied
    By Mike in Kahoka, MO on 10/06/2016

    Q4Plus performed very well. Smoked crabgrass (most looked dead in 3-4 days), although a few may have recovered. (Not so many that I'm concerned) Wild violets took longer, but virtually eliminated them. Worked very well on Lespedeza and what I believe to be Korean Clover, although it took even longer for these to die. These weeds and grass were my main targets, and the Wild Violets, Lespedeza, and Korean Clover were taking over my lawn. After local applicator repeatedly promised to spray my lawn, and never showed up(spring and fall for several yrs.), I bought my own trailer sprayer and did it myself. So glad I did. One concern is that label calls for quite a bit of water for coverage. This requires larger tips and pretty slow ground speed, but it is well worth the effort. Also received product in about three days with free shipping from DMO.

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  • 4 of 5 stars  Work good
    By John in Iowa on 09/18/2016

    See a lot of the crap grass browning up but still have clover in areas. Will hit it again to see if it knocks rest of it down.

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  • 4 of 5 stars  Very Good Results
    By Larry in michigan on 09/17/2016

    I had very good results with this product. I have tried other products such as: Bayer, Ortho etc. and using their recommended mixture amount with very little or no results. I have a 30 gallon pull behind sprayer and used it on about a 3 acre lawn in late August and it killed many of the grassy weeds and used a 2nd spot application to finish of the clover and yarrow. It was a little difficult to figure out how many oz of product to put in 30 gallons of water. But, I would highly recommend this product and will use it again next year if needed.

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  • 5 of 5 stars  Best weed control ever
    By Mike in McMurray, PA on 09/08/2016

    The weeds just wither away and disappear after a couple of weeks. Crabgrass, clover, violets, among others. I highly recommend this product if you have a need for a post-emergent weed control.

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  • 4 of 5 stars  Q4plus
    By Gerald in Mount Vernon on 09/01/2016

    Does a fantastic job killing broad leaf weeds, ausome killig water grass and sickens crab grass. Very pleased with the results

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  • 1 of 1 people found this review helpful:

    4 of 5 stars  Kikuyu grass control
    By Pro in Southern California on 08/09/2016

    Trying to control Kikuyu grass in tall fescue. Tank mixing with Turflon Ester. This mix works well for controlling other weeds as well.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Works Great
    By Ron in Lincoln, Nebraska on 07/13/2016

    Started having problems with early onset of heat this summer out of the normal Nebraska heat by a month which made watering necessary for our yard. The result was an early infestation of yellow nutsedge and a few other broadleaf weeds that pre-emergant didn't keep from sprouting. I couldn't spray the whole yard, but I picked up Q4 Plus to spot spray using a normal 1 gallon sprayer to apply during one of the few below 95 degree days in the morning when it dry. Within a day the nutsedge started turning yellow and within a week what I sprayed along with other weeds was dead. I'd say about an 85% kill ratio of what was killed. Grass was unharmed and I was very happy. Other products would only have about a 50-60 percent kill rate requiring a serious second application. Follow the instructions to the letter and it works great. Very minimal need to apply second application and I can clearly see what I missed in the week following application. Even though it was hot by mid day as long as I applied it early enough in the day when the temps were in hte low 70's the grass wasn't affected when the temps reached the mid 90's when I applied. Didn't apply any water for 24 hours after application.

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  • 4 of 5 stars  Great Product
    By Chris in Suwanee, GA on 06/08/2016

    Prior to purchasing this product, I had a lawn service come and spray every few weeks. However, they were behind and weeds were terrible. I was recommended this product from a friend and worked wonders. All the large broad leaf weeds were gone within a week. I fired my lawn company and will be doing it myself from now on. I still have some crabgrass so I guess I will be doing some spot spraying.

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  • 5 of 5 stars  Great post emergent for Midwest America
    By Nathan in EAU CLAIRE on 05/24/2016

    I live in Wisconsin and this stuff rocks!

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Most Helpful Q&A's

07/28/2013 Jason from Fort Gibson, Ok

QMixture of Q4 plus per 1000 sq. feet?

AThe mixing ratio of Q4 really depends on what and where you are treating. The product label suggests using 1.8-2.6 fl oz per one gallon to treat 1000 sq. feet.

32 of 34 people found this answer helpful.
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03/15/2013 Eric from Bear, De

QTemperature to apply Q4 Plus?
What is good outdoor temperature to spray in? What is too cold?

AThe product label for Q4 states that you should not apply the product above 90 degrees.  Although it does not give a specific temperature for being too cold, most herbicides should be applied between 65 degrees and 85 degrees.

28 of 28 people found this answer helpful.
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10/05/2014 Joseph from Raleigh, Nc

QIs Q4 safe for a backyard where a dog would roam. If not, how long after application would be required?
We have a family dog that likes to go in the backyard, but are worried that something this extreme may make him unable to be outside. Is it safe? Once it's dry is it safe? This came highly recommended, but the person recommending it didn't know how it might effect pets.

AIt will be safe for you to apply Q4 Plus Turf Herbicide and allow to completely dry prior to allowing your dog in the treated area.

17 of 17 people found this answer helpful.
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03/18/2015 Steve from Canton, Ga

QWhat is the shelf life on Q4 Plus Turf Herbicide?

AThe shelf life of Q4 Plus Turf Herbicide is 3-5 years if stored in a room temperature setting. This product should be kept out of extreme temperatures, which are under 35 degrees Fahrenheit and over 90 degrees Fahrenheit.

13 of 13 people found this answer helpful.
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10/06/2015 Jim from Hamden, Ct

QHow long before I can reseed after I have applied Q4 Plus Turf Herbicide?


If you will be reseeding the area, turf species listed on the product label can be seeded one week after the application of the Q4 Plus Turf Herbicide.

12 of 13 people found this answer helpful.
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Most Recent Customer Questions

10/11/2016 Chevo from Burke, Va

QHow long after re-seeding my tall fescue lawn in Fairfax, VA may I apply Q4 Plus?
I applied Drive xlr8 herbicide to my one acre tall fescue lawn in Fairfax, VA. 10 weeks ago, but it did NOT kill all my crabgrass. On 9/15/16, I core aerated, re-seeded, and applied McGill Compost to my lawn. The new grass is growing well, but I still have few weeds (crabgrass). Since it has been nearly 30 days since I re-seeded my tall fescue lawn, can I apply Q4 Plus Turf Herbicide to kill the remaining weeds? Our current temps are 50s at night to 60s to 70s during the day. BTW, I've already purchased and received the Q4 from your store. Thanks!


Per the product label for Q4 Plus Turf Herbicide you should delay application to grass seedlings until after the second or thrid mowing, or 28 days after emergence.

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10/10/2016 Jim from Cedar Rapids, Ia

QWhy should I only use Q4 Plus Turf Herbicide twice a year?
I was using T-Zone SE to spray my yard and switched to Q4 Plus to include getting rid of Crabgrass as well. I spray my entire yard with Q4 Plus in April and September. The label says ONLY two broadcast applications per year. The problem is the Ground Ivy (Creeping Charlie). The Q4 Plus kills 90-95% of it in April but by the time September comes around, it's all grown back. My question is why can't I spray three times a year? I would think spraying in April, July and September would probably eradicate the Ground Ivy eventually. I might take a couple years but only spraying twice a year is not going to win the battle. I believe the two applications a year is based on the 2-4D in the product.


Products such as†Q4 Plus Turf Herbicide†should only be applied the maximum amount of times listed on the product label. †This how often the manufacturer has determined it is safe for the environment to use them. As ground ivy is a winter weed, it is best controlled when products are applied in the Fall as they start to green up. †Another option is to simply pull it up in between applications, though this may take several months of doing so to gain complete control.

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09/14/2016 Bruce from Crozet, Va

QWhat is the shelf life of Q4 Plus Turf Herbicide in a garage?
I made the mistake of storing Q4 in the garage. It is not effective this year as a result. Do I need to toss the remainder in the bottle or mix the solution with more product?


Q4 Plus Turf Herbicide†should be stored in a cool dry place and not exposed to extreme temperatures, i.e. above 90 and below freezing. †If it was stored in less than optimal conditions, and you are noticing that it has separated in the bottle and with shaking will not go back into solution or it is not as effective, we would recommend replacing it.

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09/14/2016 Todd from Chicago, Il

QWhy should the first three clippings be left on the turf after applying Q4 Plus Turf Herbicide?


Most insecticides containing the active ingredient Quinclorac, such as Q4 Plus Herbicide,†will have similar labeling to allow the clippings from the first 3 mowings after application to remain on the turf. Since quinclorac stays active for many weeks and needs as much contact time on the target plants as possible, this helps to get the most effect from your sprays. Basically, we do not want to cut the grass and remove the product that we've just applied before it has had time to kill the target weeds.

Another reason to allow clippings to remain is so that they are not mulched too quickly, potentially causing damage to desirable plants†while the quinclorac may still be active enough to damage susceptible plants.

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09/11/2016 Jo from Concord, Nc

QHow long after applying Q4 Plus can I replant ajuga?
I spilled some on patio & washed down with garden hose instead of wiping up because if was approx 3+ ounces & spreading quickly. Unfortunately, I have ajuga planted beside. I kept watering it off of them. Will it keep spreading to the other mature plants? I pulled up the wilted ones. I know grass is one week but didn't see any ornamentals.


Q4 is not going to move through the soil and affect other plants that were not directly sprayed with the product. †If you have watered the area well and it did not contact others or their roots, they should be fine. †The label does state not to apply to ornamental landscape beds. †We would recommend contacting the manufacturer directly for timing of when you can apply in that area. †PBI Gordon can be reached at 800-821-7925.

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09/11/2016 Jo from Charlotte, Nc

QHow long after spraying Q4 Plus Turf Herbicide can I plant?


Per the Q4 product label:†Turf species listed on the label can be seeded into the treated areas 1 week after the application.

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09/07/2016 Athanasios from Annandale, Virginia

QCan I use Q4 and apply starter fertilizer at the same time ?


Yes, you can apply both†Q4 Plus Turf Herbicide†and starter fertilizer at the same time. Be sure you are following the product label instructions under "Cultural Tips" for restrictions around new turf and reseeding to avoid damaging desirable turfgrass.

1 of 1 people found this answer helpful.
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08/16/2016 Sherri from Saint Charles

QCan you use Q4 on desirable buffalo grass?


We do not recommend applying Q4 Plus Turf Herbicide to buffalograss since there is no mention of tolerability on the product label.

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08/14/2016 Steve from Louisville

QDo I need to add a sticking agent when using Q4 Plus Turf Herbicide?


We do recommend using a surfactant with Q4 Plus Turf Herbicide. It will help coat the plants better and provide you with the best results.

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08/03/2016 Scott from New Jersey

QHow long after applying Q4 Plus can I water?


You can water approx 6 hours after application of†Q4 Plus Turf Herbicide. It is considered "rainfast" after this time.

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