When establishing a lush, green lawn, newly planted grass is particularly vulnerable to invasive weeds. These weWeed Killer For Newly Planted Grasseds compete for essential nutrients, sunlight, and water, which can slow down grass growth or even kill tender seedlings.
Choosing the right weed killer for newly planted grass is crucial to protect young turf while preventing harmful chemicals from stunting its growth.
Unlike established lawns, new grass requires weed killers that are gentle, selective, and safe. Using the wrong product can burn seedlings, disrupt germination, or damage the soil ecosystem. That’s why homeowners, landscapers, and gardeners must be careful when selecting herbicides designed specifically for young lawns.
This detailed guide explores the 20 best weed killers for newly planted grass, outlining their benefits, safety features, and drawbacks. Each option is carefully reviewed with pros and cons, ensuring you make the right choice for a healthy, vibrant lawn.
20 Best Weed Killer For Newly Planted Grass
1. Scotts Turf Builder Triple Action – Best Pre-Emergent Weed Killer
Scotts Turf Builder Triple Action is an excellent option for homeowners who want a weed killer that also feeds young grass. It prevents crabgrass, dandelions, and other common weeds while boosting root development. The formula is designed to be safe for tender grass once it has been mowed at least once.
This product is both a weed preventer and lawn fertilizer, making it an ideal dual-purpose solution. It ensures that grass grows thicker and healthier while weeds are kept at bay. Many homeowners appreciate its ease of application using a spreader.
It is important to follow directions closely, as applying too early may affect delicate seedlings. However, once the grass is mature enough, Scotts Turf Builder provides long-lasting protection. Its effectiveness against a wide variety of weeds makes it one of the best for new lawns.
Pros:
• Dual-purpose use
• Prevents crabgrass
• Fertilizes lawn
• Easy application
• Long-lasting effect
• Boosts root growth
• Trusted brand
Cons:
• Not for sod
• Timing sensitive
• Pricey option
2. Tenacity Herbicide – Best Selective Herbicide
Tenacity Herbicide is a professional-grade option that is highly recommended for newly seeded lawns. It works as both a pre-emergent and post-emergent herbicide, controlling broadleaf weeds and grassy invaders. The formula is gentle on young grass, making it one of the safest for new lawns.
The active ingredient, mesotrione, ensures that weeds are targeted without damaging turf. It is particularly effective against crabgrass, clover, and chickweed, which often infest new lawns. Tenacity is widely used by lawn professionals due to its selective action.
This product does require careful measurement and mixing before application. However, its versatility and safety make it an excellent long-term investment for healthy lawn establishment.
Pros:
• Professional grade
• Targets broadleaf
• Safe for seedlings
• Prevents crabgrass
• Dual action use
• Long-lasting results
• Works selectively
Cons:
• Needs mixing
• Costly product
• Requires precision
3. Spectracide Weed Stop for Lawns – Best Affordable Option
Spectracide Weed Stop for Lawns is a budget-friendly weed killer that delivers strong results without breaking the bank. It is formulated to target over 200 broadleaf weed varieties, making it a versatile solution. Homeowners like its quick visible results within hours of application.
This herbicide is designed to be safe for most lawn types when applied as directed. It will not harm grass seedlings once they have been mowed a couple of times. Its affordability makes it accessible for larger yards and frequent applications.
Spectracide is not as long-lasting as professional-grade herbicides, meaning multiple applications may be necessary. Still, it is a good starting point for homeowners seeking a reliable and inexpensive option.
Pros:
• Affordable price
• Fast results
• Kills many weeds
• Lawn-safe formula
• Easy to spray
• Widely available
• Works quickly
Cons:
• Not long-lasting
• May need repeats
• Limited residual
4. Ortho Weed B Gon – Best Broadleaf Control
Ortho Weed B Gon is widely recognized for its effectiveness against tough broadleaf weeds like dandelions and clover. It is safe for new lawns once seedlings are strong enough for mowing. Its selective action means it kills weeds but spares tender grass.
The product can be applied using a ready-to-use spray bottle or hose attachment, making it convenient. Results are usually visible within 24 hours, with complete weed dieback in a few days. Ortho is also effective against creeping charlie, which is notoriously hard to control.
While powerful, Ortho Weed B Gon should be used carefully to avoid over-application. Proper timing ensures it supports healthy grass growth while eliminating weeds.
Pros:
• Broadleaf control
• Quick results
• Selective formula
• Safe for lawns
• Easy application
• Trusted brand
• Targets tough weeds
Cons:
• Needs reapplication
• Weather sensitive
• Strong odor
5. BioAdvanced All-in-One Lawn Weed Killer – Best Versatile Option
BioAdvanced All-in-One Lawn Weed Killer is an excellent choice for homeowners looking for a comprehensive solution. It kills over 200 types of weeds, including crabgrass, without harming grass. This makes it suitable for protecting tender new lawns.
The product can be applied using a hose-end sprayer, which covers large areas quickly. It works systemically, meaning it enters the weed through leaves and spreads to the root for complete kill. Visible results appear within a few days.
It is best applied when new grass has been mowed at least twice, ensuring seedlings are not affected. For long-term lawn health, this product offers a balance between safety and effectiveness.
Pros:
• All-in-one use
• Controls crabgrass
• Covers large areas
• Systemic action
• Long-lasting kill
• Easy spraying
• Fast results
Cons:
• Not for new seeding
• Needs dry weather
• Higher cost
6. GreenView Fairway Formula Weed & Feed – Best Fertilizer Combination
GreenView Fairway Formula Weed & Feed combines selective weed control with lawn fertilization. It is designed to kill common broadleaf weeds while boosting root development in tender grass. For new lawns, it provides a dual-purpose treatment that promotes growth and protection.
This formula contains slow-release nitrogen, which helps grass establish stronger roots. At the same time, it targets weeds like dandelions and plantains without harming the lawn. It is ideal for homeowners seeking efficiency in lawn care.
Though effective, timing is crucial to avoid harming fragile seedlings. It works best once new grass is established enough for regular mowing.
Pros:
• Dual-purpose use
• Slow-release feed
• Strengthens roots
• Kills broadleaf
• Trusted quality
• Long-lasting results
• Saves time
Cons:
• Timing critical
• Not for sod
• Relatively pricey
7. Southern Ag 2,4-D Amine – Best Professional Liquid Option
Southern Ag 2,4-D Amine is a professional liquid herbicide that targets a wide range of broadleaf weeds. It is commonly used in turf management and safe for lawns when applied correctly. For new grass, it is recommended once seedlings are mature enough to handle chemicals.
This product is effective against dandelions, clover, and chickweed, which often invade new lawns. It is easy to mix with water and can be applied with a sprayer for uniform coverage. Professionals prefer it for large areas due to its consistency.
Because it is concentrated, careful handling is necessary to avoid damaging grass seedlings. Its professional strength makes it a reliable long-term investment for lawn care.
Pros:
• Professional grade
• Broadleaf control
• Easy to spray
• Reliable results
• Long-lasting effect
• Cost-effective bulk
• Highly consistent
Cons:
• Requires mixing
• Timing sensitive
• Strong chemical smell
8. Preen Lawn Crabgrass Control – Best for Crabgrass Prevention
Preen Lawn Crabgrass Control is ideal for new lawns threatened by crabgrass and other annual grassy weeds. It is a pre-emergent herbicide, meaning it prevents weeds before they sprout. This makes it perfect for protecting new seedlings during their early stages.
The formula is safe for most lawn grasses, including fescue, Kentucky bluegrass, and perennial ryegrass. It provides season-long protection, ensuring weeds do not overtake tender grass. Application is simple with a spreader for uniform coverage.
It must be applied before crabgrass germinates, which means timing is key. Once applied properly, Preen helps new lawns stay weed-free during establishment.
Pros:
• Prevents crabgrass
• Season-long use
• Easy application
• Lawn-safe formula
• Works pre-emergent
• Covers large area
• Consistent results
Cons:
• Timing critical
• Not post-emergent
• May need repeats
9. Roundup for Lawns – Best Selective Roundup
Roundup for Lawns is specially formulated to target weeds without killing grass. Unlike traditional Roundup, which kills everything, this selective formula is designed for turf safety. It controls broadleaf weeds while allowing tender new grass to thrive.
It is highly effective against dandelions, clover, and crabgrass. Results are typically visible in days, with complete weed control within a week. This makes it an efficient option for new homeowners establishing lawns.
While safe for lawns, it should still be applied carefully and only when seedlings are strong enough. Its selective formula gives peace of mind when dealing with invasive weeds.
Pros:
• Selective action
• Safe for lawns
• Fast results
• Kills crabgrass
• Easy to apply
• Widely trusted
• Long-lasting
Cons:
• Expensive option
• Not for new sod
• Needs precision
10. Bonide Weed Beater Ultra – Best Cool-Weather Option
Bonide Weed Beater Ultra is unique in that it works even in cooler temperatures. For new lawns planted in early spring or fall, this product offers year-round protection. It controls tough broadleaf weeds quickly without harming turf.
The formula is fast-acting, often producing visible results within 24 hours. It is effective against creeping charlie, ground ivy, and clover. Homeowners appreciate its flexibility across different climates and seasons.
Although powerful, it should be applied carefully to avoid damaging young grass. With proper use, it ensures lawns remain weed-free in various conditions.
Pros:
• Cool-weather use
• Fast-acting results
• Safe for lawns
• Targets tough weeds
• Easy application
• Flexible formula
• Year-round option
Cons:
• Higher cost
• Needs reapplication
• Can stress seedlings
11. Espoma Organic Weed Preventer – Best Organic Option
Espoma Organic Weed Preventer is a corn gluten meal-based product that prevents weeds naturally. It is safe for children, pets, and the environment, making it ideal for eco-conscious homeowners. The formula also adds nitrogen, which supports new grass growth.
This organic option prevents crabgrass, dandelions, and other annual weeds from sprouting. It is best applied in early spring before germination occurs. For new lawns, it offers both safety and soil improvement.
Because it is organic, results may take longer compared to synthetic herbicides. However, its safety profile makes it a reliable choice for delicate new grass.
Pros:
• Organic formula
• Safe for pets
• Adds nitrogen
• Eco-friendly choice
• Prevents crabgrass
• Improves soil
• Gentle on grass
Cons:
• Slower results
• Seasonal timing
• Needs repeats
12. Pennington Ultragreen Crabgrass Preventer Plus Fertilizer – Best Preventer with Feed
Pennington Ultragreen offers dual benefits by preventing crabgrass while fertilizing grass seedlings. It is designed to strengthen roots and improve color in new lawns. At the same time, it reduces weed competition.
The slow-release nitrogen ensures steady feeding for weeks. Meanwhile, the herbicide component prevents common annual weeds from sprouting. This balance of nutrition and protection is perfect for establishing turf.
However, it should be applied carefully to avoid overwhelming fragile seedlings. When timed correctly, Pennington Ultragreen is a reliable solution for lawn success.
Pros:
• Dual-purpose use
• Prevents crabgrass
• Strengthens roots
• Improves color
• Long-lasting feed
• Easy to spread
• Trusted brand
Cons:
• Timing sensitive
• Not post-emergent
• Higher cost
13. Ferti-Lome Weed-Out – Best for Large Areas
Ferti-Lome Weed-Out is designed for covering large lawns efficiently. It is effective against more than 200 types of broadleaf weeds, making it a versatile option. Its concentrated formula ensures long-lasting results.
The product is safe for grass when applied as directed, even in newly planted areas after mowing. It works systemically, killing weeds down to the roots. This prevents regrowth and maintains healthy turf.
Because it is concentrated, careful mixing is required. For homeowners with expansive lawns, this is a cost-effective choice.
Pros:
• Covers large area
• Systemic action
• Long-lasting results
• Broadleaf control
• Safe for lawns
• Cost-effective bulk
• Reliable strength
Cons:
• Needs mixing
• Precision required
• Strong formula
14. Bayer Advanced Southern Weed Killer – Best for Southern Lawns
Bayer Advanced Southern Weed Killer is designed specifically for warm-season grasses common in southern regions. It targets tough broadleaf weeds without harming grass seedlings. Its tailored formula ensures compatibility with southern turf types.
This product works well on St. Augustine, Bermuda, and Zoysia grasses. It controls clover, dollarweed, and oxalis effectively. For new southern lawns, it is a safe and reliable option.
Though specialized, it may not be ideal for cool-season grasses. Homeowners in southern climates find it highly effective.
Pros:
• Southern formula
• Safe for turf
• Kills broadleaf
• Easy application
• Trusted brand
• Tailored solution
• Fast action
Cons:
• Region-specific
• Limited versatility
• Pricier option
15. Gordon’s Trimec Lawn Weed Killer – Best Classic Formula
Gordon’s Trimec is a classic lawn herbicide trusted for decades. It controls dandelions, clover, and chickweed without harming grass. For new lawns, it should be used once seedlings are strong enough for mowing.
The formula combines multiple active ingredients for effective broadleaf control. It is popular among professionals and homeowners alike. Trimec delivers reliable results across various lawn types.
While powerful, over-application can stress grass seedlings. Proper timing ensures optimal effectiveness without damage.
Pros:
• Trusted formula
• Broadleaf control
• Professional strength
• Works systemically
• Consistent results
• Widely available
• Long-lasting
Cons:
• Needs precision
• Not for sod
• Timing matters
16. MSM Turf Herbicide – Best Low-Rate Application
MSM Turf Herbicide is a highly concentrated product that requires very little per application. It controls broadleaf weeds effectively while being safe for lawns. Its low-rate usage makes it cost-effective long term.
This product is often used in professional turf management. It is effective against clover, dandelions, and other persistent weeds. Its systemic action ensures complete weed elimination.
Because it is strong, careful handling is essential, especially for new lawns. When applied correctly, it provides excellent results with minimal product use.
Pros:
• Low-rate use
• Long-lasting
• Professional grade
• Cost-effective bulk
• Systemic action
• Controls broadleaf
• Consistent results
Cons:
• Requires care
• Strong formula
• Not beginner-friendly
17. Vigoro Weed & Feed – Best Budget Weed and Feed
Vigoro Weed & Feed combines affordability with effectiveness. It kills broadleaf weeds while providing essential nutrients for new grass. The dual formula supports stronger turf growth.
The product is easy to apply with a spreader. It works well on dandelions, clover, and plantains. Homeowners like its budget-friendly price compared to premium options.
Although affordable, it may not last as long as high-end weed killers. Still, it is a practical choice for those seeking value.
Pros:
• Affordable option
• Dual-purpose use
• Easy application
• Kills broadleaf
• Strengthens turf
• Covers large area
• Widely available
Cons:
• Not long-lasting
• Timing matters
• Fewer nutrients
18. Hi-Yield Atrazine Weed Killer – Best for St. Augustine Grass
Hi-Yield Atrazine Weed Killer is tailored for St. Augustine and centipede grasses. It controls a wide variety of weeds without harming southern turf. For new lawns in warm regions, it offers targeted safety.
The product is effective against chickweed, clover, and spurge. It also provides pre-emergent control for crabgrass. This dual action makes it versatile and reliable.
Because it is specialized, it may not suit all grass types. Southern homeowners find it particularly useful.
Pros:
• Tailored formula
• Safe for St. Augustine
• Kills broadleaf
• Prevents crabgrass
• Dual action use
• Long-lasting results
• Regionally trusted
Cons:
• Region-limited
• Not universal
• Strong formula
19. Image Herbicide for Southern Lawns – Best Dollarweed Control
Image Herbicide is well-known for controlling tough weeds like dollarweed and nutsedge. It is designed for southern lawns and safe for use on young turf. This makes it a valuable product for regional homeowners.
It works by targeting weeds through roots, ensuring long-term elimination. The formula is selective, sparing grass seedlings from damage. Results are visible within weeks.
However, it may take longer than fast-acting herbicides. Still, its specialized action against difficult weeds is highly appreciated.
Pros:
• Targets dollarweed
• Controls nutsedge
• Safe for turf
• Selective action
• Long-term results
• Tailored formula
• Reliable choice
Cons:
• Slower results
• Region-specific
• Pricier option
20. Monterey Weed Stopper II – Best Granular Preventer
Monterey Weed Stopper II is a granular pre-emergent herbicide designed for lawns. It prevents weeds like crabgrass and annual bluegrass from sprouting. Its ease of application makes it suitable for new homeowners.
The formula is safe for most turf types, including cool-season grasses. It offers season-long protection with a single application. For new lawns, it provides weed-free establishment conditions.
It must be applied before weeds germinate, so timing is critical. With proper use, it ensures a healthy, green lawn.
Pros:
• Granular formula
• Easy to spread
• Season-long use
• Prevents crabgrass
• Safe for lawns
• Consistent results
• Long-term protection
Cons:
• Timing critical
• Not post-emergent
• Limited versatility
Weed Killer For Newly Planted Grass FAQs
1. Can I use weed killer immediately after planting grass seed?
No, most weed killers should not be used immediately. Wait until seedlings have been mowed at least once or twice before application. This ensures the grass is strong enough to handle herbicides.
2. What type of weed killer is safest for new lawns?
Selective herbicides are safest, as they target weeds without harming grass. Pre-emergent products like Tenacity or organic options like Espoma are good choices. Always check the label for compatibility with new grass.
3. How soon after applying weed killer can I mow my lawn?
It’s best to wait at least 2–3 days after application. Mowing too soon may reduce the effectiveness of the herbicide. Allow the product to absorb fully into weeds before mowing.
4. Will weed killers damage my grass seedlings?
If applied too early, yes. Always ensure seedlings are mature enough and have been mowed once or twice. Following instructions carefully prevents accidental lawn damage.
5. Can I use organic weed killers for newly planted grass?
Yes, organic options like Espoma Weed Preventer are safe and effective. They may work slower but offer eco-friendly protection. They also improve soil health naturally.
6. How often should I apply weed killer on new grass?
It depends on the product and weed pressure. Pre-emergents are usually applied once per season, while post-emergents may require repeat applications. Always follow label instructions.
7. Should I water my lawn after applying weed killer?
Some products require watering in, while others need dry conditions to work. Pre-emergents usually need watering, while post-emergents often don’t. Always check application guidelines.
Conclusion
Choosing the best weed killer for newly planted grass ensures your lawn grows thick, green, and weed-free. From organic options like Espoma to professional-grade solutions like Tenacity, each product offers unique benefits. Timing, grass type, and application method are critical to protecting young lawns.
Investing in the right product not only eliminates weeds but also supports root development and soil health. With careful application, your lawn will thrive without competition from invasive weeds.
Your dream lawn starts with smart choices. Protect your new grass today by selecting a weed killer that matches your needs and region.
Take action now and give your lawn the best start possible with a safe, effective weed killer for newly planted grass!