Does your beautiful green lawn suddenly sprout ugly, fuzzy patches of crabgrass? It’s a frustrating sight every summer! That coarse, bright green weed just seems to take over when you aren’t looking. You want that perfect carpet of grass, but crabgrass laughs at your efforts.
Choosing the right crabgrass killer can feel like navigating a maze. Should you use a pre-emergent to stop it before it starts? Or do you need a post-emergent spray for the sneaky invaders already popping up? The labels are confusing, and you worry about harming your good grass or the pets playing nearby. Nobody wants to waste time and money on a product that doesn’t work.
This guide cuts through the confusion. We will break down exactly what you need to know to conquer crabgrass this season. You will learn the best timing, the safest products, and simple steps for a weed-free lawn. Ready to reclaim your yard? Let’s dive into the best crabgrass killers available right now.
Top Crabgrass Killer For Lawns Recommendations
- Water-Based Formulation: Experience the power of our unique water-based formulation that ensures superior control and faster plant uptake, delivering results you can see quickly
- Extended Residual Control: Enjoy up to 30 days of residual control, keeping your turfgrass free from troublesome weeds for longer periods and reducing the need for frequent applications; Rainfast in less than an hour
- Broad-Spectrum Weed Control: Effectively targets a wide range of weeds, including crabgrass, foxtail, kikuyu grass, signal grass, torpedo grass, and key broadleaves like bindweed, clover, dandelion, black medic, and horseweed
- Versatile Application: Perfect for residential lawns, golf courses, commercial properties, and other non-residential turfgrass sites. It is labeled for use on both warm-season and cool-season turf types, ensuring adaptability to various environments; See label for proper mixing instructions
- USE AS INTENDED: Read, understand and follow label safety and application instructions; Follow proper storage and disposal instructions; NY can only be applied as a spot application; Proper PPE required long sleeve shirt, long pants, socks and shoes, chemical resistant gloves; See label for environmental hazards; State restrictions may apply
- WEED KILLER SPRAY FOR LAWNS: With a simple hose-end application, kill weeds in your lawn, including dandelions, chickweed, clover, crabgrass and foxtail with Ortho WeedClear Lawn Weed Killer Ready-to-Spray
- FAST-ACTING WEED CONTROL: This weed killer hose sprayer kills listed weeds like crabgrass, dandelion, clover, chickweed and creeping charlie down to the root and gets results with 1 application
- COVERAGE: This 32 fl. oz. container of Ortho WeedClear Lawn Weed Killer Ready-to-Spray provides up to 5,000 sq. ft. of lawn care
- HOW TO USE: Apply to listed lawn weeds that are young and actively growing by connecting your garden hose to the weed killer sprayer, sliding the switch to "ON" and spraying evenly until the lawn is wet
- WHERE TO USE: This spray weed killer for lawns won't harm lawn grasses when used as directed - use on lawn grasses including Bermudagrass, Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass and Zoysiagrass
- One application prevents crabgrass all season long
- Apply in spring to prevent crabgrass and problem weeds all season long
- Fall application prevents winter weeds, such as poa annua, henbit and chickweed
- Rain, snow or freezing weather after application won't affect product performance
- Apply in fall to prevent moss
- Roundup for Lawns Crabgrass Destroyer2 kills crabgrass and grassy weeds to the root
- This weed killer for lawns is formulated to kill even the toughest crabgrass and grassy weeds
- Apply this product to Kentucky bluegrass, fine fescue, perennial ryegrass and tall fescue
- Apply this product to actively growing weeds (during the early growth stages for the best results), when daytime temperatures are between 45°F and 90°F
- This 64 oz. container of Roundup for Lawns Crabgrass Destroyer2 is ready-to-use with a trigger sprayer
- ALL-IN-ONE FORMULA: BioAdvanced's All-in-One formula kills listed lawn weeds and crabgrass without harming the lawn
- KILLS TOUGH WEEDS: Control over 200 broadleaf weeds like dandelion, clover, and crabgrass using our powerful weed killer concentrate
- DOWN TO THE ROOT: BioAdvanced All-In-One Lawn Weed and Crabgrass Killer I penetrates and removes tough listed weeds down to the root
- RAINPROOF IN ONE HOUR: Our weed killer concentrate formula is rainproof in one hour, providing protection that wont wash away
- EASY-TO-USE CONCENTRATE: Easily apply with our concentrated formula, perfect for targeting weeds in your lawn, and compatible with various grass types
- Kills over 200 of the most Common broad leaf weeds like dandelions and Clovers
- This product won't harm you lawn when used as directed
- Rainproof in 1 hour
- Use in tank Sprayers, dial-n-spray and hose-end Sprayers
- The fastest, easiest way to treat the entire lawn
- KILLS WEEDS – NOT THE LAWN: When used as directed
- VISIBLE RESULTS IN 5 HOURS: Conquer unruly weeds and see visible results in as fast as 5 hours
- KILLS 470+ WEED TYPES AS LISTED: Kills broadleaf and grassy weeds including dandelion, chickweed and clover as well as crabgrass and yellow nutsedge – see product label for complete list of weed types
- KILLS THE ROOT: Kills weeds by contact down to the root
- READY-TO-USE FORMULA: No mixing required
- Weed killer for lawns: Kill crabgrass, dandelion, clover and other listed common weeds in your lawn with Ortho WeedClear Lawn Weed Killer Ready-To-Use
- Fast-acting weed control: This weed control product kills like crabgrass, dandelion, clover, chickweed and creeping charlie down to the root and gets results with 1 application
- Spot treatment for weeds: Won't harm lawn grasses when used as directed - use on lawn grasses including Bermudagrass, Buffalograss, Fescues, Kentucky Bluegrass, Ryegrass, and Zoysiagrass
- Spray weed killer: Apply to weeds that are young and actively growing in the spring or fall; spray to lightly cover weed leaves
- Ready to use: This 1 gal. container of Ortho WeedClear Lawn Weed Killer Ready-to-Use includes the battery-powered Comfort Wand to accurately target weeds you want to kill
Your Guide to Crushing Crabgrass: Choosing the Best Lawn Killer
Crabgrass can turn a beautiful green lawn into a patchy mess. Learning how to choose the right killer helps you win the battle. This guide walks you through what matters when you shop.
Key Features to Look For
When you look at crabgrass killer labels, several features stand out. These tell you how effective the product will be for your lawn.
1. Pre-Emergent vs. Post-Emergent
- Pre-Emergent: This type stops crabgrass seeds from sprouting in the first place. You apply it *before* the crabgrass appears, usually in early spring. Think of it as a shield.
- Post-Emergent: This type kills the crabgrass that has already sprouted and is growing. This is your cleanup crew for existing weeds.
2. Selective vs. Non-Selective
This is very important for your healthy grass.
- Selective Killers: These target only the crabgrass. They leave your desirable lawn grasses (like fescue or bluegrass) unharmed. Most homeowners need this type.
- Non-Selective Killers: These kill *everything* they touch, including your good grass. Use these only for spot treatments where you plan to reseed later.
3. Application Method
Some products come as granules you spread with a spreader. Others are liquids you mix with water and spray. Choose the method you find easiest to use evenly across your lawn.
Important Materials and Ingredients
The active ingredients are the true powerhouses inside the bottle or bag. You need to know what they are.
Common Active Ingredients
- For Pre-Emergent: Look for chemicals like Pendimethalin or Prodiamine. These stop the seeds from growing roots.
- For Post-Emergent: Quinclorac is a very common ingredient. It works well against established crabgrass without usually harming established turf.
Safety and Formulation
Check the label for safety ratings. Some products are pet-safe once they dry. Always read the waiting time before letting kids or pets back onto the treated area.
Factors That Improve or Reduce Quality
The quality of the killer depends on timing and the formula itself.
What Improves Quality (Effective Use)
- Timing: Applying pre-emergent when soil temperatures hit 55 degrees Fahrenheit for several days greatly improves success.
- Proper Coverage: Using the right spreader setting ensures you don’t miss spots or overlap too much.
- Watering In: Granular products often need a light watering right after application to activate the chemicals.
What Reduces Quality (Common Mistakes)
- Late Application: Applying post-emergent when the crabgrass is already huge makes the product less effective.
- Heavy Rain: If heavy rain washes the product away shortly after you apply it, the chemicals might not stay in the topsoil long enough to work.
- Old Product: Using crabgrass killer that has sat in the shed for several years might mean the active ingredients have lost their strength.
User Experience and Use Cases
How easy is the product to use? How fast does it work?
Ease of Use
Liquid concentrates require mixing, which some people find messy. Granular products need a spreader but offer very even coverage. Good packaging often includes clear measuring lines or simple pour spouts.
Use Cases
- Yearly Prevention: Use a pre-emergent in early spring for a full season of protection.
- Emergency Cleanup: Use a fast-acting post-emergent in mid-summer if you see small patches popping up unexpectedly.
- Large Infestations: For lawns completely taken over, you might need to use a non-selective killer, kill everything, and then reseed the entire area later in the fall.
10 Frequently Asked Questions (FAQ) About Crabgrass Killers
Q: When is the best time to apply pre-emergent crabgrass killer?
A: Apply it in the early spring, usually when your soil temperature consistently reaches 55 degrees Fahrenheit. This stops the seeds from sprouting.
Q: Can I use crabgrass killer when I have dogs or cats?
A: Check the label carefully. Most products require you to keep pets off the lawn until the product has completely dried, which can take several hours.
Q: Will crabgrass killer hurt my established St. Augustine grass?
A: If you buy a *selective* killer designed for your specific grass type, it should not harm your good lawn. Always double-check the label!
Q: My crabgrass is already big and green. Should I use pre-emergent or post-emergent?
A: Big, green crabgrass needs a post-emergent killer. Pre-emergent only stops seeds from growing; it won’t kill the established plants.
Q: How long does it take for post-emergent killer to work?
A: You often see results within 7 to 14 days. The crabgrass will usually start to turn yellow or brown.
Q: Do I need to water the lawn after spreading granular crabgrass killer?
A: Yes, most granular products require a light watering right after application to wash the chemical down into the soil where it needs to work.
Q: Is it better to use a liquid spray or dry granules?
A: This depends on your preference. Liquids often penetrate faster, but granules spread more easily with a standard lawn spreader for large areas.
Q: What happens if I apply the pre-emergent too late?
A: If you apply it too late, the seeds have already sprouted. The product will not work effectively against the visible weeds.
Q: Can I fertilize my lawn at the same time as applying crabgrass killer?
A: Many products combine fertilizer and pre-emergent (often called “Weed and Feed”). If you use separate products, check the labels to ensure they can be safely applied together.
Q: How often should I reapply crabgrass killer?
A: Pre-emergent products usually last for one growing season. Follow the label instructions, but generally, you reapply them every spring.