Does your dream lawn look more like a patchy battlefield against stubborn weeds? You spend hours mowing, watering, and caring for your grass, only to see unwelcome invaders steal its vibrant green. It is frustrating when dandelions and crabgrass pop up everywhere, ruining your hard work.
Choosing the right weed killer fertilizer can feel like a confusing maze. Should you pick a fast-acting spray or a slow-release granular product? Do you need a product for broadleaf weeds or grassy ones? These choices directly affect your lawn’s health and the time you spend battling those pesky plants. Getting it wrong means wasted money and a less-than-perfect yard.
This guide cuts through the confusion. We will break down exactly what you need to know about weed killer fertilizers. You will learn how these products work, which type suits your specific lawn problems, and how to apply them safely for the best results. Get ready to transform your turf from weedy to wonderful. Let’s dive into finding the perfect formula for your perfect lawn!
Top Weed Killer Fertilizer For Lawns Recommendations
- FALL LAWN WEED & FEED: Scotts Turf Builder WinterGuard Fall Weed & Feed3 is a lawn weed killer and lawn fertilizer that controls weeds and feeds grass in the fall for a better lawn next spring
- KILLS CLOVER AND DANDELION: Fall weed and feed is a dandelion weed killer and kills over 50 listed lawn weeds, including clover, plantain, morningglory, chicory, eveningprimrose, and purslane
- APPLY IN FALL TO PREPARE YOUR LAWN FOR WINTER: Apply weed control plus grass fertilizer to a moist lawn when weeds are actively growing and temperatures are consistently between 60°F and 90°F
- LAWN GRASS TYPES: This lawn care product is for use on Bahiagrass, Bermudagrass, Bluegrass, Centipedegrass, Fescue, Ryegrass, and Zoysiagrass (see label for restrictions)
- SMALL LAWN COVERAGE: One 11.43 lb. bag of Scotts Turf Builder WinterGuard Fall Weed & Feed3 covers 4,000 sq. ft.
- WEED AND FEED FOR LAWNS: Apply this combination weed killer for grass and lawn food to your wet lawn when weeds are actively growing and daytime temperatures are consistently between 60°F and 90°F; don't apply more than 2X per year
- WEED KILLER PLUS LAWN FOOD: Scotts Turf Builder Weed & Feed5 weed killer plus fertilizer for grass is a clover and dandelion killer for lawns that also feeds to thicken your lawn and crowd out future weeds
- DO NOT USE ON: Do not use this grass fertilizer for lawns plus yard weed killer on St. Augustinegrass (including Floratam), Dichondra, Lippia, Carpetgrass, and Bentgrass lawns
- USE ON LISTED GRASS TYPES: Apply this lawn care product to Bahiagrass, Bermudagrass, Bluegrass, Centipedegrass, Fescue, Ryegrass, and Zoysiagrass
- WEED CONTROL FOR LAWNS: These Scotts weed killer plus lawn fertilizer granules control over 50 listed lawn weeds, including clover, dandelion, plantain, morningglory, chicory, eveningprimrose, and purslane
- 3-IN-1 FORMULA: Scotts Turf Builder Triple Action1 is a three-in-one lawn fertilizer and weed control formula that kills listed lawn weeds, prevents crabgrass, and feeds grass to build thick, green lawns
- WHERE TO USE: This grass fertilizer, crabgrass preventer, and clover and dandelion killer for lawns is for use on Bahiagrass, Centipedegrass, Kentucky Bluegrass, Perennial Ryegrass, Bermudagrass, Tall Fescue, Fine Fescue, and Zoysiagrass
- LAWN WEED CONTROL: This lawn care product is a weed killer for lawns that controls dandelion, clover, dollarweed, ground ivy, chickweed, plantain, henbit, English daisy, and other listed lawn weeds
- CRABGRASS PREVENTER: This pre-emergent weed killer also prevents crabgrass for 4 months (will not kill existing crabgrass); stops other listed grassy weeds from invading your lawn
- HOW TO USE: Apply to a wet lawn with a Scotts spreader, then water in after 24 hours; apply in early spring when dandelions are actively growing
- Up to 2X more powerful dandelion and clover control (vs. previous formula)
- Clears out dandelions and clover—satisfaction guaranteed
- Weedgrip Technology grips the weeds you see—and the ones you don't
- Scotts most powerful weed and feed
- Feeds to thicken lawns and crowd out weeds
- Up to 2X more powerful dandelion and clover control (vs. previous formula)
- Clears out dandelions and clover—satisfaction guaranteed
- Weedgrip Technology grips the weeds you see—and the ones you don't
- Scotts most powerful weed and feed
- Feeds to thicken lawns and crowd out weeds
- 3-IN-1 FORMULA: Scotts Turf Builder Triple Action1 is a three-in-one lawn fertilizer and weed control formula that kills listed lawn weeds, prevents crabgrass, and feeds grass to build thick, green lawns
- WHERE TO USE: This grass fertilizer, crabgrass preventer, and clover and dandelion killer for lawns is for use on Bahiagrass, Centipedegrass, Kentucky Bluegrass, Perennial Ryegrass, Bermudagrass, Tall Fescue, Fine Fescue, and Zoysiagrass
- LAWN WEED CONTROL: This lawn care product is a weed killer for lawns that controls dandelion, clover, dollarweed, ground ivy, chickweed, plantain, henbit, English daisy, and other listed lawn weeds
- CRABGRASS PREVENTER: This pre-emergent weed killer also prevents crabgrass for 4 months (will not kill existing crabgrass); stops other listed grassy weeds from invading your lawn
- HOW TO USE: Apply to a wet lawn with a Scotts spreader, then water in after 24 hours; apply in early spring when dandelions are actively growing
- QUICK NITROGEN BOOST: Scotts Liquid Turf Builder with Plus 2 Weed Control is a weed killer and grass fertilizer for lawns that gives a quick boost of nitrogen while controlling weeds
- EASY-TO-USE: To apply the lawn food and weed killer spray, simply attach this hose-end applicator to your garden and spray lawn; apply when weeds are actively growing for best results
- BROADLEAF WEED KILLER: This weed killer for lawns with grass fertilizer targets buckhorn, chickweed, ground ivy, henbit, knotweed, lambsquarters, oxalis, pigweed, plantain, poison ivy, ragweed, and spurge
- KILLS LISTED WEEDS: This lawn weed killer plus fertilizer kills dandelions, clover, and other listed lawn weeds
- COVERAGE: Scotts Liquid Turf Builder with Plus 2 Weed Control 32 fl. oz. Ready-To-Spray covers up to 6,000 sq. ft. for warm season lawns and 4,000 sq. ft. for cool season lawns
- Scotts Turf Builder WinterGuard Fall Weed & Feed5 weed killer and lawn fertilizer controls listed weeds and feeds grass in the fall for a better lawn next spring
- Fall weed and feed kills over 50 listed lawn weeds, including clover, dandelion, plantain, morningglory, chicory, evening primrose, and purslane
- Apply weed control plus grass fertilizer to a wet lawn when weeds are actively growing and temperatures are consistently between 60°F and 90°F
- This lawn care product can be used on Bahiagrass, Bermudagrass, Bluegrass, Centipedegrass, Fescue, Ryegrass, or Zoysiagrass
- One 11.28 lb. bag of Scotts Turf Builder WinterGuard Fall Weed & Feed5 covers 4,000 sq. ft.
Your Guide to Choosing the Best Weed Killer Fertilizer for a Lush Lawn
A beautiful, green lawn free of pesky weeds is something many homeowners dream about. Weed killer fertilizers are a great tool for this job. They feed your grass while simultaneously attacking unwanted plants. This guide helps you pick the right product for your yard.
Key Features to Look For
When shopping, several features make a weed killer fertilizer better than others. Think about what your lawn needs most.
1. Active Ingredients
Look closely at the label for the active ingredients. These are the chemicals that actually kill the weeds. Common effective ingredients include 2,4-D, Dicamba, and MCPP. These chemicals target broadleaf weeds like dandelions and clover. Make sure the label lists ingredients that fight the weeds you see most often. Some products use different chemicals for different weed types.
2. Fertilizer NPK Ratio
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K). These numbers show the strength of the fertilizer part.
- Nitrogen (N): Makes grass green and encourages fast growth. High numbers here are usually good for color.
- Phosphorus (P): Helps with root development. Less important for established lawns.
- Potassium (K): Boosts overall plant health and stress resistance (like heat or drought).
A good all-around ratio for spring application is often higher in Nitrogen (e.g., 20-0-5).
3. Application Type (Granular vs. Liquid)
How you apply the product matters for convenience and effectiveness.
- Granular: These look like tiny pellets. You spread them with a broadcast or drop spreader. They are generally easier to store and apply without making a mess. Rain or watering is needed afterward to activate them.
- Liquid: You mix these with water and spray them directly onto the weeds. They work faster because the roots absorb the chemical quickly.
Important Materials and Safety
The materials inside determine how safe and effective the product is. Always check the safety warnings.
Safety Labels
Because these products contain herbicides (weed killers), safety is paramount. Look for clear instructions on Personal Protective Equipment (PPE). You should wear gloves and long sleeves when handling or applying. Keep pets and children off the lawn until the product has dried or soaked in completely, as directed on the bag or bottle.
Slow-Release Nitrogen
Higher quality fertilizers often use slow-release nitrogen sources. This means the grass gets fed steadily over several weeks instead of one big burst. This prevents sudden, weak growth spurts that can lead to burning or excessive mowing.
Factors That Improve or Reduce Quality
Quality is affected by formulation and timing.
Improving Quality: Targeted Formulas
Products specifically labeled for your grass type (like fescue, bluegrass, or St. Augustine) work better. Different grasses handle chemicals differently. A product formulated for cool-season grasses might harm warm-season grasses.
Reducing Quality: Dormant Grass or Extreme Weather
Applying weed killer fertilizer when grass is stressed reduces its effectiveness. If your lawn is dormant (brown in winter) or experiencing extreme heat (over 85°F), the grass cannot properly absorb the fertilizer or resist the herbicide. Applying during these times often results in burned grass or weeds that survive.
User Experience and Use Cases
How easy is the product to use, and when should you apply it?
Ease of Use
For beginners, granular products that clearly state spreader settings offer the best experience. Liquid products require careful measuring and calibration of your sprayer, which can be tricky. Read reviews to see if users found the application process straightforward.
Best Use Cases (Timing)
The best time to use most weed killer fertilizers is in the **spring** (when weeds are actively growing) or **early fall**. Fall application is excellent because the grass is strong, and the weeds pull the killer down to their roots before winter dormancy. Avoid applying in the middle of summer heat.
10 Frequently Asked Questions (FAQ) About Weed Killer Fertilizers
Q: How fast will I see results on the weeds?
A: Liquid weed killers often show visible yellowing or wilting within 3 to 7 days. Granular products take longer, usually 10 to 14 days, because they need water to activate.
Q: Can I use this product if I have new grass seed?
A: No. Most weed killer fertilizers contain herbicides that stop all seed germination. Wait until the new grass is established (usually after 3 or 4 mowings) before applying.
Q: Will this kill my good grass?
A: If you use the product correctly and it targets “broadleaf weeds,” it should not harm common lawn grasses. Always check the label to ensure it is safe for your specific grass type.
Q: What is the ideal temperature for application?
A: Most manufacturers recommend applying when temperatures are between 60°F and 80°F. Avoid application if rain is expected within 24 hours, unless it is a liquid formula designed for immediate rain wash-in.
Q: How often should I fertilize with this combined product?
A: Usually, you apply these combination products 2 to 4 times per growing season. Follow the specific re-application interval listed on the product bag or bottle.
Q: What do I do if my pet licks the treated area?
A: If you suspect ingestion, call your veterinarian or the product’s poison control hotline immediately. Keep pets off the lawn until it is completely dry.
Q: Do I need to water the lawn after spreading granular weed killer fertilizer?
A: Yes. Watering is essential for granular products. The water dissolves the fertilizer and moves the weed killer down to the roots to start working.
Q: Can I use this on my vegetable garden?
A: Absolutely not. Herbicides can drift or run off into your vegetable patch and damage or poison your edible plants.
Q: What is the difference between a ‘weed and feed’ and a ‘weed killer fertilizer’?
A: They are generally the same thing. “Weed and Feed” is a common brand name for products that fertilize while killing weeds.
Q: Does this product work on grassy weeds like crabgrass?
A: Most standard weed killer fertilizers target broadleaf weeds (like clover). If you have grassy weeds, you need a product specifically labeled as a “pre-emergent” or “post-emergent” crabgrass killer.