Imagine this: you’ve spent hours meticulously caring for your lawn, only to see those unwelcome, fuzzy green invaders creep in. Crabgrass. It’s a gardener’s nemesis, and once it takes root, it can be a real headache to get rid of. You’ve probably seen those shelves packed with different bottles, all promising to be the magic solution. But how do you pick the one that actually works without harming your beautiful grass?
Choosing the right crabgrass post-emergent can feel like navigating a maze. You want to banish the crabgrass, but you also don’t want to damage your existing lawn. It’s a common frustration for many homeowners, and the sheer number of products can be confusing. You might wonder which ones are effective, safe, and the best value for your money.
Don’t worry, we’re here to help! This post will break down what you need to know about crabgrass post-emergents. We’ll help you understand how they work, what to look for on the labels, and how to choose the best option for your lawn. By the end, you’ll feel confident in making a choice that will help you reclaim your lawn from those pesky crabgrass plants.
Top Crabgrass Post Emergent 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
- 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
- Superior Crabgrass Control: Unsurpassed control of crabgrass, even at mature stages
- Broad-Spectrum Control: Effectively targets foxtail, kikuyugrass, signalgrass, torpedograss, and key broadleaves like clover, dandelion, and bindweed.
- Rapid Action & Rainfastness: Proprietary water-based formula ensures fast uptake, becoming rainfast in less than one hour.
- Extended Residual: Provides 30–45 days of residual weed control.
- Versatile Application: Suitable for use on residential lawns, golf courses, commercial turf, and sod farms.
- KILLS WEEDS, NOT THE LAWN: Controls listed weeds – including crabgrass – not the lawn (when used as directed).
- KILLS CRABGRASS: Apply the first time you see crabgrass in your lawn.
- KILLS 470+ TYPES OF WEEDS: Controls all types of listed broadleaf and grassy weeds, including crabgrass, dandelion, chickweed, clover and yellow nutsedge (see product label for complete list).
- RAINPROOF: Rainfall or watering 3 hours after application will not wash away effectiveness.
- COVERAGE: 32 ounce bottle treats up to 5,000 square feet.
- WEED PREVENTION: Scotts Halts Crabgrass & Grassy Weed Preventer prevents the germination of listed lawn weeds so you can enjoy your lawn
- CRABGRASS PREVENTER: Prevents the germination of crabgrass, foxtail, spurge, barnyardgrass, and more as listed in the early spring all season long, and moss (except in California), Poa annua, henbit, corn speedwell, and chickweed in the fall
- APPLICATION: Apply this pre-emergent weed and crabgrass killer in the early spring to a dry lawn or in the fall; rain, snow, or freezing weather after application will not affect the performance of this lawn care product
- GRASS TYPES: This pre-emergent weed preventer is for use on all grass types (with the exception of Dichondra or Bentgrass)
- COVERAGE: One 20.12 lb. bag of Scotts Halts Crabgrass & Grassy Weed Preventer covers 10,000 sq. ft.
- 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
- ELIMINATE GROWN WEEDS: This post-emergent herbicide acts swiftly on already-sprouted weeds, allowing you to reclaim your garden from nuisances like crabgrass, and foxtail after they've shown up
- EASY AND VERSATILE: Whether you're dealing with a small patch or a large infestation, our pint and quart sizes are perfect for any situation; Plus, our weed killer works well with multiple types of grass—like perennial rye, Bermuda, zoysia, and fescue—so you can tackle weeds without harming your lawn
- COST-EFFECTIVE SOLUTION: Stretch your dollar further with our weed killer; Just 1.5 fluid ounces covers a 1,000 square feet, and three tablespoons mix into a gallon of water for efficient weed control
- EPA APPROVED: Gain peace of mind with this certified solution, designed to be both effective and safe across various settings
- CONVENIENT SIZE OPTIONS: We've got you covered whether you're treating a small patch or a large area; Pick from 16 ounces or 32 ounces to best suit your needs;PLEASE NOTE: Weed sprayer is sold separately
Conquer Crabgrass: Your Ultimate Post-Emergent Buying Guide
Crabgrass can be a real nuisance in your lawn. It pops up when the weather gets warm and spreads quickly. It looks different from your regular grass, often with wider leaves and a clumpy growth pattern. Don’t let it take over! Post-emergent crabgrass killer is your secret weapon to get rid of it after it has already sprouted.
Why Choose Post-Emergent?
Pre-emergent treatments stop crabgrass seeds from sprouting. Post-emergent treatments kill crabgrass that has already grown. You might need both for the best defense. This guide will help you pick the right post-emergent product for your lawn.
Key Features to Look For
Targeted Action
The best products target crabgrass specifically. They kill the weed without harming your desirable lawn grasses. Look for labels that clearly state they are “post-emergent crabgrass killers.” Some products kill a wide range of weeds, which is also good, but make sure crabgrass is on the list.
Speed of Action
You want to see results quickly. Some treatments start working within hours, while others take a few days. Faster-acting products can stop the spread of crabgrass before it becomes a bigger problem.
Lawn Safety
This is super important. You don’t want to kill your own grass while trying to kill weeds! Check the product label to make sure it is safe for your specific type of lawn grass. Common lawn grasses include fescue, bluegrass, and ryegrass. If you have a special type of grass, like St. Augustine or centipede grass, you’ll need to find a product that is safe for those.
Ease of Use
Many post-emergent killers come in spray bottles or concentrates that you mix with water. Choose a format that is easy for you to handle and apply. Ready-to-use sprays are great for smaller lawns, while concentrates are more economical for larger areas.
Important Materials (Active Ingredients)
The “active ingredient” is what actually kills the crabgrass. Different products use different ingredients. Here are some common ones:
- Quinclorac: This is a very effective ingredient for killing crabgrass. It works well on both young and mature crabgrass. It is also safe for most common lawn grasses.
- Fenoxaprop-p-ethyl: Another strong crabgrass killer. It’s known for its quick action. Again, check the label to ensure it’s safe for your lawn type.
- MSMA (Monosodium Methanearsonate): This ingredient is very effective but can be harsher on some grasses. It’s often used by professionals. It is less common in homeowner products now.
- Dithiopyr: This ingredient can act as both a pre-emergent and a post-emergent. It’s a good option if you want a product that does a bit of both.
Factors That Improve or Reduce Quality
What Makes a Product Better?
- Proven Effectiveness: Look for brands that have a good reputation. Read reviews from other homeowners.
- Specific Formulation: Some products are designed to work better in certain temperatures or on specific stages of crabgrass growth.
- Combination Formulas: Some post-emergent products also kill other common weeds like dandelions or clover. This can save you time and money.
What Can Make a Product Less Good?
- Broad-Spectrum Herbicides: If a product kills all plants, it will kill your lawn too. Always choose selective herbicides.
- Poorly Written Labels: Confusing instructions or unclear warnings can lead to mistakes and damage to your lawn.
- Outdated Formulas: Newer formulations are often more effective and safer for your lawn.
User Experience and Use Cases
When to Use Post-Emergent Crabgrass Killer
You use post-emergent crabgrass killer when you see crabgrass growing in your lawn. This is typically from late spring through the summer. The best time to apply is when the crabgrass is young and actively growing. It’s more sensitive then.
How to Apply
Always follow the instructions on the product label. This usually involves mixing the product with water and spraying it evenly over the affected areas of your lawn. You might need to water your lawn before or after application, depending on the product. Avoid applying when it’s very hot, windy, or about to rain. You don’t want the spray to drift or wash away.
Tips for Success
- Timing is Key: Apply when crabgrass is young.
- Read the Label: Always read and follow all instructions.
- Spot Treat: Focus on the areas where you see crabgrass.
- Be Patient: It may take a few applications to get rid of all the crabgrass.
Frequently Asked Questions (FAQ)
Q: What is the main difference between pre-emergent and post-emergent crabgrass killer?
A: Pre-emergent stops crabgrass seeds from sprouting. Post-emergent kills crabgrass that has already grown.
Q: When is the best time to use a post-emergent crabgrass killer?
A: Apply it in late spring or summer when you see crabgrass growing and it’s still young.
Q: Can I use post-emergent crabgrass killer on any type of grass?
A: No, always check the product label to make sure it’s safe for your specific lawn grass.
Q: How long does it take to see results?
A: It varies, but many products start working within a few days to a week.
Q: Do I need to water my lawn after applying?
A: Some products require watering before or after application. Always check the label.
Q: Can I use post-emergent if it’s very hot outside?
A: It’s best to avoid applying when it’s extremely hot, as it can stress your lawn.
Q: Will one application get rid of all the crabgrass?
A: You might need multiple applications for complete control, especially if the infestation is bad.
Q: What are some common active ingredients in post-emergent crabgrass killers?
A: Common ingredients include Quinclorac, Fenoxaprop-p-ethyl, and Dithiopyr.
Q: Can I use a post-emergent if I also have other weeds?
A: Some products kill multiple types of weeds. Check the label to see if it targets other weeds you have.
Q: What should I do if I accidentally spray my flowers or garden?
A: Unfortunately, most crabgrass killers will harm or kill desirable plants. It’s best to be very careful during application.