A thick, green lawn is the goal, but the dandelions, clover, and crabgrass that crash the party are a relentless frustration. You want to feed your grass to make it strong, but standard fertilizer just gives the weeds a growth spurt too. The shortcut isn’t spending every weekend hand-pulling invaders — it’s using a product that feeds your turf while chemically tackling the broadleaf weeds at the root.
I’m Mo Maruf — the founder and writer behind The Tools Trunk. I’ve spent years analyzing lawn care chemistry, from nitrogen release curves to herbicide active ingredients, to help homeowners cut through the marketing hype and select the exact granular or liquid solution their grass type demands.
Whether you are prepping for fall or rescuing a summer lawn, the right fertilizer to kill weeds in lawn combines slow-release feeding with post-emergent herbicides that target over 250 common broadleaf species without damaging your turf.
How To Choose The Best Fertilizer To Kill Weeds In Lawn
Not all weed-and-feed products are interchangeable. Choosing the right bag or bottle hinges on your grass type, the specific weeds you’re battling, and the season you’re applying. Here are the three critical factors that separate a successful lawn transformation from a waste of money.
Nitrogen Source and Release Timing
Look for a bag that contains slow-release nitrogen (often coated or polymer-encapsulated urea). A 32-0-5 analysis with sustained release feeds your lawn evenly for four months without sending it into a frantic green growth spurt. Quick-release nitrogen forces rapid leaf growth that pulls energy from the roots, leaving the turf weak against weed re-infiltration.
Herbicide Spectrum and Grass Type Compatibility
The “weed killer” half of the equation needs to be a selective broadleaf herbicide. Most quality products control over 50 to 250 species including dandelion, clover, and plantain. But that same chemistry can damage St. Augustine or centipede grass if misapplied. Always check the label for your specific turf species before buying.
Application Method and Coverage Area
Granular weed-and-feed requires a rotary or drop spreader and must be applied to a wet lawn, followed by 24 hours without rain. Liquid formulas attach to a garden hose and offer better spot treatment but require two to three applications for stubborn weeds. Granular bags typically cover 4,000 to 16,000 square feet per bag; liquid bottles handle roughly 7,500 square feet per fill.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| The Andersons Professional Surge | Granular | Large lawns & heavy weed pressure | 16,000 sq ft coverage per bag | Amazon |
| Jonathan Green Weed & Feed | Granular | Controlling 250+ weed species | 21-0-3 NPK, 3-month feeding | Amazon |
| GreenView Fairway Formula | Granular | All-around lawn strengthening | 63% slow-release N, 33 lb bag | Amazon |
| Scotts WinterGuard Weed & Feed3 | Granular | Fall lawn prep & clover control | Kills 50+ weeds, 4,000 sq ft | Amazon |
| Scotts WinterGuard Weed & Feed5 | Granular | Targeting dandelion & morningglory | 11.28 lb, 4,000 sq ft coverage | Amazon |
| Pennington Full Season 32-0-5 | Granular | Low-maintenance one-time feeding | 4-month slow release, 5% iron | Amazon |
| Spectracide Weed & Feed Spray | Liquid | Easy hose-on spot treatment | 20-0-0, 7,500 sq ft per bottle | Amazon |
In‑Depth Reviews
1. The Andersons Professional Surge Weed and Feed
The Andersons Surge is a professional-grade granular product that packs a four-way post-emergent herbicide into a 16-0-9 NPK base. Each 40-pound bag covers up to 16,000 square feet, making it the most economical choice for anyone managing a half-acre or larger lawn. The small particle size means more points of contact per square inch, which directly translates to better herbicide coverage against deep-rooted dandelions and creeping Charlie.
Reviews confirm that this product delivers on its claim of eliminating over 250 common weeds, with multiple users reporting Creeping Charlie and crabgrass failure after previous attempts with standard store brands failed. The slow-release nitrogen component keeps the lawn fed for the entire growing season without producing a weak, rapid top-growth flush. The 16-0-9 ratio is specifically lean on phosphorus, making it a responsible choice for areas near waterways.
The major catch is compatibility: this product is not safe for Floratam St. Augustine, dichondra, carpetgrass, or creeping bentgrass. It also cannot be shipped to New Hampshire or Washington due to state regulations. For homeowners with compatible turf like tall fescue or Bermuda, this is the highest-performing, longest-lasting weed-and-feed on the market.
What works
- Massive 16,000 sq ft coverage per bag
- Four-way herbicide eliminates 250+ weed types
- Slow-release nitrogen feeds all season
- Small particles ensure even distribution
What doesn’t
- Not compatible with Floratam St. Augustine or bentgrass
- Cannot be shipped to NH or WA
- Heavy 40 lb bag requires a robust spreader
2. Jonathan Green Green-Up Weed & Feed
Jonathan Green has built a loyal following among lawn purists, and the Green-Up Weed & Feed is the flagship reason why. The 21-0-3 analysis provides a high-nitrogen, no-phosphorus feed that gradually releases nutrients for up to three months from a single application. The real headline is the herbicide: this formula controls over 250 broadleaf weeds including poison ivy, wild onions, and even thistle — going far beyond what most weed-and-feed bags claim.
The fine particle size is a deliberate engineering choice. Smaller granules mean more individual herbicide contact points per square foot, which helps the active ingredients translocate down to the root system more effectively. Users report visible weed die-off in roughly two weeks, with the grass responding with deep greening and improved density. The bag covers up to 5,000 square feet, which places it squarely in the premium slot per-square-foot.
Be aware that this product cannot be used simultaneously with overseeding because the herbicide is potent enough to harm establishing grass seedlings. Some users experienced clumping in the bag, so shake it thoroughly before loading your spreader. The price-per-bag is higher than commodity brands, but for homeowners with diverse weed populations, the expanded weed list justifies the investment.
What works
- Controls 250+ broadleaf weed species
- Slow-release nitrogen feeds for 3 months
- Fine particles improve herbicide contact
- Effective against poison ivy and thistle
What doesn’t
- Cannot be used during overseeding
- Bag may contain clumps
- Higher cost per square foot than competitors
3. GreenView Fairway Formula Lawn Fertilizer
GreenView Fairway Formula is built around a proprietary blend containing 63% slow-release nitrogen with zero phosphate. The 33-pound bag covers 10,000 square feet, making it one of the best price-per-coverage options available. While this product is primarily a lawn fertilizer and not a true weed-and-feed with herbicide, it deserves attention because a thick, well-fed lawn naturally crowds out weeds via competition, reducing the need for chemical intervention.
The slow-release nitrogen feeds the lawn for up to 12 weeks without the surge growth that attracts pests and diseases. Users consistently report visible dark greening within a week of application, particularly after rainfall. The blue-dyed granules prevent streaking by making overlap visible during spreader passes — a smart design detail that prevents those embarrassing brown burn lines common with drop spreaders.
This is the correct choice if your primary problem is a thin, weak lawn rather than an active weed infestation. The no-phosphorus formula is also environmentally considerate near lakes and streams.
What works
- 63% slow-release feeds for 12 weeks
- No phosphate protects waterways
- Blue granules prevent spreader overlap
- 33 lbs covers 10,000 sq ft
What doesn’t
- No built-in herbicide
- Requires separate weed treatment
- Heavy bag requires a sturdy spreader
4. Scotts Turf Builder WinterGuard Weed & Feed3
The third-generation Scotts WinterGuard Weed & Feed3 is a fall-focused granular product designed to kill weeds while building root strength for spring green-up. The 11.43-pound bag covers 4,000 square feet and targets over 50 listed broadleaf weeds including clover, dandelion, and plantain. Application timing is specific: the grass must be moist, the air temperature between 60°F and 90°F, and no rain for 24 hours after spreading.
User reviews highlight the effectiveness against clover specifically, with die-off visible within two weeks of application. Several customers report that this product replaced costly professional lawn service and delivered comparable results. The fall feeding component is designed to strengthen the root system for winter dormancy, giving the lawn a head start the following spring. The granular form works well with both rotary and drop spreaders.
Spreaders that aren’t calibrated can produce visible streaks of dead grass where the herbicide concentrated at too high a rate. This is a user error, not a product flaw, but it means you should test your spreader setting on a small patch first. For homeowners looking to knock down fall weeds and prep for a strong spring lawn, this is a reliable, predictable choice.
What works
- Targets 50+ weed species effectively
- Fall application builds spring root strength
- Compatible with 7 major grass types
- Clover die-off in about 2 weeks
What doesn’t
- Inconsistent spreader calibration can streak
- Narrower weed spectrum than premium products
- Requires specific temperature range to work
5. Scotts Turf Builder WinterGuard Weed & Feed5
The WinterGuard Weed & Feed5 is the updated version of Scotts’ fall staple, tweaking the formulation for better performance on weeds such as morningglory, evening primrose, and purslane. The 11.28-pound bag covers the same 4,000 square feet as the Weed & Feed3, but the herbicide package has been expanded to include evening primrose and chicory in the kill list. The formula is optimized for fall application — apply it when nighttime temps are consistently between 60°F and 90°F.
Customer reviews consistently note impressive results within one month. Weeds begin browning at the three-week mark, while the grass visibly thickens and greens. Users with tall fescue and bluegrass varieties report the best results, and many highlight that skipping a single annual application allowed dandelions to return the following season. The product is easiest to spread with a push spreader on a wet lawn, and the 24-hour no-rain window is non-negotiable for full efficacy.
This version is priced slightly above the Weed & Feed3 but offers a broader weed control list for the same coverage area. If you specifically battle evening primrose or chicory, the Weed & Feed5 is the better Scotts selection. For general fall cleanup, both versions perform similarly — the choice comes down to which weeds are showing up in your yard.
What works
- Kills morningglory, evening primrose & purslane
- Visible grass thickening within 3 weeks
- Excellent for tall fescue and bluegrass
- Easy spreader application on wet lawn
What doesn’t
- Very cold temps (<60°F) reduce efficacy
- Manual calibration prevents streaking issues
- Must wait 24 hours without rain
6. Pennington Full Season Lawn Fertilizer 32-0-5 4M
Pennington’s Full Season Fertilizer uses polymer-coated urea technology to release nitrogen slowly over four months from a single application. The 32-0-5 NPK ratio is heavy on nitrogen, includes 5% iron for deep greening, and contains natural beneficial microorganisms that improve soil biology over time. It is designed for homeowners who want a lazy, one-and-done approach — apply once in the spring and the feed does the work through the summer.
The 11.2-pound bag is light, even by weed-and-feed standards, and some users report the coverage is closer to 2,500 square feet than the advertised 4,000. This is a granular fertilizer that supports a thick lawn; it does not contain herbicide. For weed control, you’ll need to pair it with a separate spot-treatment. The microorganisms are a genuine differentiator at this price point, helping break down thatch and improve nutrient availability in compacted soil.
This is the right product if your yard’s primary problem is weak growth and yellowing rather than a heavy weed invasion. The low entry price makes it an affordable starter product, but buyers with established weed pressure should budget for an additional herbicide application. Note that this product is not available for shipping to Hawaii or South Dakota.
What works
- One spring application feeds for 4 months
- 5% iron delivers rapid color improvement
- Contains beneficial soil microorganisms
- Very affordable entry price
What doesn’t
- No herbicide included
- Coverage is less than advertised for some users
- Not available in HI or SD
7. Spectracide Weed & Feed 20-0-0
Spectracide Weed & Feed takes a completely different approach: it is a liquid concentrate that attaches directly to your garden hose via the included QuickFlip sprayer. The 20-0-0 NPK ratio means it is heavy on nitrogen for immediate greening, and the herbicide targets major broadleaf weeds including dandelion, chickweed, knotweed, clover, and purslane. Each 32-ounce bottle treats up to 7,500 square feet, and this pack includes three bottles plus one nozzle assembly.
The liquid format offers distinct advantages. You can spot-spray individual weed patches rather than blanketing the entire lawn with chemicals, and the hose-end application is significantly faster than loading a spreader, especially on smaller properties. Customers report visible weed browning within a few weeks, though tougher species like wild violets may require three applications for complete control. The fertilizer component delivers visible greening after about two weeks with adequate rainfall.
There are two practical trade-offs. The formula leaves a sulfur-like smell that lingers for a few days after application, and wind drift can damage nearby garden plants — particularly tomatoes. The liquid format also requires more frequent application than a slow-release granular. For homeowners who prefer spray-and-go convenience over spreader calibration, this is a strong-performing, budget-efficient alternative.
What works
- Hose-end sprayer is quick and easy to use
- Covers 7,500 sq ft per bottle
- Liquid format allows targeted spot treatment
- Fast visible greening and weed browning
What doesn’t
- Strong lingering sulfur smell
- Wind drift can damage adjacent plants
- Stubborn weeds need up to 3 treatments
Hardware & Specs Guide
Understanding the key specifications on a weed-and-feed bag prevents costly mistakes. Here are the two most critical specs to evaluate before buying.
N-P-K Analysis
The three-number ratio on the bag stands for Nitrogen (N), Phosphorus (P), and Potassium (K). For weed-and-feed products, you typically want a high first number (nitrogen) to drive leaf growth and green color. A ratio around 21-0-3 or 32-0-5 is ideal because it supplies ample nitrogen while keeping phosphorus at zero to protect waterways. The third number (potassium) supports root health and disease resistance. Avoid anything with a phosphorus number above 5 unless a soil test indicates a deficiency, as excess phosphorus contributes to algae blooms.
Slow-Release Percentage
The percentage of nitrogen that is slow-release (often listed as “slow-release nitrogen” or “polymer-coated urea”) determines how long the feeding lasts. A product with 60% or more slow-release nitrogen feeds the lawn steadily for 10 to 16 weeks without causing a growth surge. Products with mostly quick-release nitrogen force rapid top growth that looks good for two weeks then fades, while simultaneously nourishing weeds just as aggressively as your grass. Always check the fine print for the slow-release percentage before comparing products by price.
FAQ
Can I apply weed and feed at the same time as overseeding?
Should I water the lawn before or after applying granular weed and feed?
What temperature range is required for weed and feed to work?
Why did my weed and feed burn brown stripes into my lawn?
Final Thoughts: The Verdict
For most users, the fertilizer to kill weeds in lawn winner is the The Andersons Professional Surge Weed and Feed because it delivers professional-grade four-way herbicide in a 16-0-9 slow-release base at a coverage area that cuts the number of bags you buy in half. If you want the absolute widest weed control spectrum and have a smaller lawn, grab the Jonathan Green Green-Up Weed & Feed. And for homeowners who prefer the speed and convenience of a hose-end sprayer, nothing beats the Spectracide Weed & Feed 20-0-0 for targeted spot treatment without dragging out a spreader.