Weed Killer for Kentucky Bluegrass Lawns

A white bag of Lawn Synergy Starter 15-20-10 professional lawn fertilizer with green geometric accents and branding.

RECOMMENED NOW

Emerald 10-0-20

Tall Fescue, Kentucky Bluegrass, Zoysia, St. Augustine, and Centipede Lawns.

RECOMMENED NOW

Almighty 20-0-10

Bermuda Lawns & Lawns needing more nitrogen.

Seeding or Sod

Starter Fertilizer

The Key to Faster Germination & Stronger Roots

Organics Option

BioBoost

Build up organics within the soil while also feeding the lawn.

Measure Your Lawn

Order the correct amout of product based on the sq ft of your lawn.

Spreader Settings

Common spreader settings for various lawn products.

Explore Now

Shop by Category

Lawn Fertilizer

Feed your lawn for season-long results.

Grass Seed

Clean weed-free seed for a ultra-dark green lawn.

Weed Control

Clean up pesky weeds that don't belong in your lawn.

Fungicide

Prevent and cure disease in your lawn and ornamentals.

Insecticide

Don't let insects destroy your lawn. Treat ticks mosquitos, and more.

Shop By Lawn Type

Tall Fescue

Bermuda

Zoysia

St. Augustine

Centipede

Northern Lawns

Not sure what your lawn needs?

Join our Lawn of the Year Program and take the guesswork out of lawn care. We’ll deliver the right products at the right time, so your lawn gets exactly what it needs all season long.

Learn More

How It Works

1

Choose Your Lawn

Tell us your lawn type and goals.

2

Get Your Program

We recommend the right products and timing.

3

Apply With Confidence

Simple steps for a thicker, greener lawn.

1

Choose Your Lawn

Tell us your lawn type and goals.

2

Get Your Program

We recommend the right products and timing.

3

Apply With Confidence

Simple steps for a thicker, greener lawn.

Weed Killer for Kentucky Bluegrass Lawns — Kentucky bluegrass is a premium cool-season turf, but it takes the right weed control to keep it thick, dark green, and weed-free. This collection features selective herbicides that work great on Kentucky bluegrass, helping you control weeds without damaging your lawn when applied as directed.

Whether you’re dealing with clover, dandelions, crabgrass, ground ivy, nutsedge, or unwanted grasses, these professional-grade products are trusted by lawn care pros and serious DIY homeowners. You’ll also find spray additives that improve coverage and performance for more consistent results.

At Lawn Synergy, you’re not just buying a product—you’re getting access to expert support. If you’re unsure what to choose or how to mix and apply it, our team can help with product selection, mixing instructions, application timing, and best practices so you can get professional results without the guesswork.

Weeds This Collection Helps Control in Kentucky Bluegrass

Broadleaf weeds: dandelion, clover, chickweed, plantain, ground ivy (creeping charlie)
Sedges: yellow nutsedge and other sedge species
Grassy weeds: crabgrass, goosegrass, unwanted grasses
Tough weeds: violets, oxalis, wild onion, and deep-rooted broadleaf weeds

Quick Guide: Pick the Right Weed Killer

Weed Problem	Great Product Options	Why It Works
Clover, Dandelions & Broadleaf Weeds	Triad Select, T-Zone SE, Q4 Plus, Lesco 3-Way, De-Amine 4, Trimec (granular)	Selective broadleaf herbicides that target weeds while protecting Kentucky bluegrass
Ground Ivy (Creeping Charlie) & Violets	Triclopyr 4 Ester, T-Zone SE, Q4 Plus	Triclopyr-based options help control waxy, deep-rooted weeds
Nutsedge	SedgeHammer, Vexis(granular)	Targets sedges specifically and is widely used on cool-season lawns
Crabgrass & Some Grassy Weeds	Q4 Plus, Quintesstial	Strong post-emergent option for crabgrass control in many turf scenarios
Unwanted Grasses (Specialty Use)	Fusilade II, Ornamec, Ethofumasate, Vexis	Specialty herbicides for specific grassy weed situations—selection and timing matter
Better Coverage & Better Results	Spray Booster	Helps sprays stick and spread for improved absorption and performance

Current Best Sellers

Headway G Fungicide

$78.95

Prevent and cure disease

Emerald 10-0-20 Lawn Fertilizer

$39.99

Low nitrogen stress blend

Almighty 20-0-10 Lawn Fertilizer

$39.99

High nitrogen for growth

Bifen 7.9F Insecticide

$29.95

Treats insects and mosquitos

Pro-Grade Products

Fast Shipping

DIY Friendly

Expert Support

Got Questions?

Frequently Asked.

Are these weed killers safe for Kentucky bluegrass?

Yes—these products are commonly used on Kentucky bluegrass when applied according to the label. Always follow rates, temperature guidelines, and turf restrictions.

What’s the best weed killer for clover in Kentucky bluegrass?

Triad Select, Lesco 3-Way, De-Amine 4, and T-Zone SE are great options depending on the weed mix and severity.

What should I use for ground ivy (creeping charlie) or violets?

Products containing triclopyr (like Triclopyr 4 Ester and some multi-way mixes) are often the best choice for waxy, deep-rooted weeds.

What kills nutsedge in Kentucky bluegrass?

SedgeHammer is a trusted option for nutsedge control on cool-season lawns.

Do I need a surfactant or spray additive?

Often, yes. A spray adjuvant like Spray Booster can improve coverage, sticking, and absorption—especially on mature or waxy weeds.