Q4 Plus Weed Control
All-in-one weed control for crabgrass, yellow nutsedge, and common broadleaf weeds.
$56.95
$59.99
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Made in the USA
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Product Description
Control crabgrass, yellow nutsedge, and broadleaf weeds with one professional-strength lawn treatment. Q4 Plus combines four active ingredients to control several types of weeds without requiring separate products for grassy weeds, sedges, and broadleaf weeds.
It is a good choice for lawns with a mix of common weeds, including crabgrass, foxtail, yellow nutsedge, clover, chickweed, dandelion, and ground ivy.
Why Choose Q4 Plus?
- Controls Multiple Weed Types: Targets grassy weeds, sedges, and broadleaf weeds in one application.
- Controls Crabgrass and Nutsedge: Handles two of the most frustrating weeds found in home lawns.
- Works on Common Broadleaf Weeds: Controls clover, chickweed, dandelion, ground ivy, and many other listed weeds.
- Built-In Surfactant: No additional surfactant is normally needed.
- Use on Several Lawn Types: Labeled for Tall Fescue, Kentucky Bluegrass, Ryegrass, Bermuda, and Zoysia lawns.
Best Uses
- Lawns with crabgrass and broadleaf weeds growing together
- Yellow nutsedge mixed with other common lawn weeds
- Spot-treating weeds throughout the lawn
- Blanket applications when weeds are spread across a large area
- Spring, summer, and fall applications while weeds are actively growing
Application Rate
Cool-Season Lawns: Mix 2.6–3.0 fl oz per 1,000 sq ft.
Bermuda and Zoysia Lawns: Mix 1.8–2.6 fl oz per 1,000 sq ft.
Mix the measured product with enough water to evenly cover 1,000 sq ft. A common starting point is 1 gallon of finished spray per 1,000 sq ft, but the water is only the carrier. The measured amount of Q4 Plus and the treated square footage are what matter.
How to Apply
- Measure the lawn area you plan to treat.
- Add water to your pump or backpack sprayer.
- Measure the correct amount of Q4 Plus for your lawn type.
- Add the product to the tank and mix thoroughly.
- Spray the weeds and leaf surfaces evenly without excessive runoff.
- Allow the treatment to dry before allowing people or pets back onto the lawn.
Important Application Information
- Apply when weeds are actively growing.
- Do not apply to drought-stressed or heat-stressed grass.
- Avoid mowing for 1–2 days before and after application.
- Allow at least 6 hours without rain or irrigation after applying.
- Wait at least 7 days before seeding most labeled grasses.
- Wait at least 14 days before seeding Kentucky Bluegrass.
- Always follow the product label for your grass type, weeds, and local restrictions.
Do not use on St. Augustinegrass or Centipedegrass.
COMMON QUESTIONS
Frequently Asked Questions
Product resources
Product Information & Resources
Everything you need to understand, apply, and reference this product.
Details & Specifications
| Active Ingredient | Quinclorac - 8.43% Sulfentrazone - 0.69% 2,4-D, dimethylamine salt - 11.81% Dicamba, dimethylamine salt - 1.49% OTHER INGREDIENTS - 77.58% |
|---|---|
| Lawn Types | Tall fescue, Bermuda, Zoysia, Kentucky bluegrass, Ryegrass |
| Special Features | Rain fast in 6 hours. Contains a surfactant. |
| Application Rate | |
| Time to Apply | Spring, Summer, Fall |
| Shipping Restrictions | AK, CA, LA, HI, MA, PR, NY, TX, WY, WV |
| Waiting Period to Seed | Minimum 7 days, 14 days on Kentucky Blue Grass |
| Delivery System | Liquid |
| For Use In | Turf Grass |
| Brand | PBI Gordon |
Spreader Settings
Customer Reviews
Overall rating: 4.28 / 5 from 25 reviews.
AI Generated Review Summary
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Review highlights
Reviews
Awesome product. I can see
"Awesome product. I can see the crabgrass and weeds turning yellow and dieing to show off my beautiful lawn."
Product works amazing, the lawn
"Product works amazing, the lawn is weed free!"
Crabgrass control was ok, not
"Crabgrass control was ok, not great."
I applied as a direction
"I applied as a direction requested and also added sticker fluid but it barely killed the weeds I will try again or try different product"
My first time using product,
"My first time using product, very impressed how weeds were dying without hurting grass. I would recommend Q4."
Doesn’t Work and Can’t Refund
"I rarely leave negative reviews, and I want to start by saying that I’ve had great experiences with Lawn Synergy overall. Their other products have worked well for me, and my past interactions with their team have been positive. That’s why this situation has been so frustrating. I purchased their Q4 herbicide for my tall fescue lawn here in Charlotte, NC to deal with the typical weeds we get in this region. After applying it exactly as directed, I saw essentially no effect on the weeds. I emailed Lawn Synergy about it, and they told me to wait two more weeks as apparently the product is extremely sensitive to temperature changes and because sometimes it takes longer to work. I did exactly that and waited. Two weeks later there was still no meaningful change at all. When I followed up again, asking for a refund since the product clearly wasn’t working, I was told they cannot refund opened products and that they are only the distributor, so I would need to contact a third party manufacturer to resolve the issue. From start to finish, this has been a frustrating experience: 1) Product didn’t work as advertised 2) I followed their instructions and waited longer 3) No resolution was offered Again, I really appreciate this company and what they have to offer, but this product is not up to their standard."
Excellent
"Excellent, it works."
Killed my tall fescue
"Killed my tall fescue"
Great product and price, but bottle leaking
"The product and price were great, but did not expect to have one of the bottles leaking upon opening the box. Bottles were shipped using paper bags as packing material."
Q4 Plus Turf Herbicide for Grassy & Broadleaf Weeds
"Great results in a few days! Well satisfied with this product."
Q&A
- Is this correct, 16oz for 64oz of water in a tank sprayer for cool season lawns?
- Depending on your lawn type, Mix 1.8-3 oz per 1 gallon. 1 gallon will need to cover 1,000 sq. ft. of the lawn area.
- Can I apply four hours before rain?
- Q4 requires 6 hours of dry time before it is rain fast
- How long after before can pets be on it
- As soon as it is dry, it's safe for people and pets.
- How often should I use this product? I'm thinking of applying it to turf type tall fescue in mid July in Pennsylvania.
- You can apply and spot spray as needed.
- Will Q4 kill Creeping Charlie?
- Yes! Creeping Charlie ground ivy is listed on the label.