Weeds That Look Like Grass

List of Common Weeds That Look Like Grass

You’ve been working hard on cultivating the perfectly manicured lawn, taking all the necessary steps to plant seed or sod, fertilize, and mow appropriately. Despite your best efforts, there seem to be patches of your lawn that don’t match the rest. There are some common weeds that look like grass which tend to blend in with a lawn and thus can be more difficult to identify and target when compared to the average dandelion.

In this article I’ll help you identify these grass-like weeds and offer advice for how to combat and eliminate them from your lawn.

Trust and Accuracy Information

This article was last updated on by Lawn Chick Owner Sarah Jameson
Article content reviewed for accuracy by Certified Horticulturist Nicole Forsyth, M.S.

Common Weeds That Look Like Grass

Click to jump to a specific weed that resembles grass

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Crabgrass

Crabgrass - A Common Weed That Looks Like Grass
Crabgrass is a Common Weed that Looks like Grass – photo courtesy UNH Extension

Also known as finger grasses, crabgrass can be an invasive type of weed that looks very much like grass.

It often sprouts in smaller patches throughout your lawn and has a distinctly coarse texture compared to the rest of your lawn. Thankfully, crabgrass is an annual plant so it only survives for the season and then dies.

That said, it spreads quickly, and because of its thick blades and lateral growth, it can quickly do permanent damage to your lawn by crowding out and smothering the grass surrounding it.

This is why it’s important to be vigilant and act right away if you see crabrass in your lawn.

The best way to get rid of crabgrass is by preventing its germination using a pre-emergent herbicide that can be commonly found in combination with fertilizer that you can spread in early spring.

Once crabgrass has germinated, the best way to get rid of it is by pulling it or using a direct herbicide for your lawn.

Thankfully, crabgrass is not perennial so it is relatively easy to get rid of it with some diligence, and once you improve your lawn the canopy will be too dense for crabgrass to grow.

Some Expert Advice on Crabgrass

Shane Evans is a Lawn Water Conservation Educator and Maggie Reiter is an Extension Turfgrass Educator at University of Minnesota Extension.

These experts tell us that as an annual plant, crabgrass “will germinate in the spring, grow throughout the summer, and die as late fall or winter begins.”

In many cases, you’ll be able to identify crabgrass “by the older leaves and sheathes turning a dark-reddish color.” If your lawn is unhealthy or thin, crabgrass is more likely to appear. 

Shane and Maggie point out that “A crabgrass plant can produce thousands of seeds every year meaning crabgrass control can potentially be very important to the overall health of your lawn.”

To prevent crabgrass, these experts recommend applying “a pre-emergent herbicide before the crabgrass seed in your lawn can germinate.” They emphasize that timing your application is critical, as most pre-emergents aren’t effective if applied after weeds have begun to grow.

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Wild garlic and onion

Wild Garlic (pictured) is a grass-like weed that could be invading your lawn
Wild Garlic (pictured) is a grass-like weed that grows in clumps – photo courtesy OSU

While it looks very much like a tall grass, wild onion and wild garlic are very fragrant and thus these grass-like weeds are pretty unmistakable once you get close enough to smell them.

If you finish mowing and it smells like you’ve been making pasta sauce, there’s a good chance you have some wild onion and/or wild garlic hiding in your lawn.

Wild onion and wild garlic also become noticeable as they grow faster than regular grass and quickly surpass the height of your lawn.

They grow in clumps, so if you have them, the rate of growth and growth habit make them pretty easy to identify.

For those who love garlic and onion as an addition to many dishes, this may be more of a fortuitous find (transplant them!). However, even the biggest garlic fans probably don’t want a swath of it in the middle of their lawn.

Thankfully, these weeds that resemble grass tend to only grow in early spring and late fall, becoming dormant in the summer season.

To remove them from your yard, dig them up (I recommend transferring them to a pot or herb garden) – just make sure to get bulb and all, or they’ll come back.

Herbicides will also work to kill wild garlic and onion, just make sure to check the label of the product your purchase to ensure that wild garlic and onion are included in the list of weeds it treats.

Nutsedge

Yellow Nutsedge - A Common Weed That Looks Like Grass
Light-colored, fast-growing blades of Yellow Nutsedge – photo courtesy Purdue Extension

Before it matures and blooms, nutsedge can look much like a tall grass.

Unlike crabgrass, Nutsedge is a perennial weed that can be quite invasive and difficult to get under control due to its hardy root systems.

It can also be spread throughout your lawn (or from a neighbor’s lawn) both by airborne seeds as well as underground rhizomes or tubers. It will continue to come back year after year unless you get it under control.

Sort of like fight club, the first rule of Nutsedge is not to pull Nutsedge.

If you try to combat it by pulling it, you’re likely to leave behind tubers or rhizomes that will end up sprouting.

One of the most effective ways to prevent Nutsedge is to grow a thick and hardy lawn that will crowd out Nutsedge, and prevent this invasive grass-like weed from being able to properly root and grow those rhizomes and tubers that make it so invasive.

But if you have it, recommending that you hop in your time machine and take steps to prevent it doesn’t help you.

If you have Nutsedge in your lawn, there are specific herbicides that can be applied directly to the base of Nutsedge to kill the entire plant including the underground components, and while I always recommend an organic approach when I can, in this case this will be your best course of action.

Click here to read my article about killing Nutsedge.

What Experts Recommend About Dealing with Nutsedge in Your Lawn

Karen Russ is a Former HGIC Horticulture Specialist, and Chuck Burgess is a Former HGIC Horticulture Extension Agent, at Clemson University. These experts explain that one of the best ways of preventing Nutsedge growth is by doing regular lawn care and keeping your Turfgrass thick and healthy. 

This will give your grass a “competitive advantage by following all recommended practices for the lawn species, including mowing at the ideal height, applying fertilizer at the proper rate and time, and maintaining the ideal soil pH.” 

Expert Perspective

The Lawn Chick editorial team regularly interviews industry experts to bring our readers the latest science and expert recommendations to complement our own hands-on lawn care experience. 

We Asked: Why is maintaining a thick, healthy lawn one of the best ways to prevent weeds naturally?

Will Answered:By maintaining a thick lawn, you’ll be able to limit the amount of ground available for these weeds to take hold, all while promoting the lawn of your dreams and avoiding unnecessary harsh chemicals or preventative herbicide applications.”

Will Seip, Expert Lawn Advisor at Sunday

Will Seip

Expert Lawn Advisor at Sunday

Born and raised just south of Buffalo, NY, it has been quite a journey for Will getting to explore warm-season grasses after having a hodgepodge of fescue, bluegrass and rye in his lawn growing up. Will graduated from Cornell with a B.S. in Environmental and Sustainability Sciences, with a concentration in Land, Air and Water Resources.

Common couch

Common Couch or Quackgrass is a Weed That Looks Very Much Like Grass
Couch grass or Quackgrass can be difficult to identify in lawns – photo courtesy MSU

Another common weed that looks like grass is couch grass or common couch.

Sometimes referred to as quack grass, this is another invasive species that is hardy and can propagate quickly in your lawn via rhizomes as part of a complex and fibrous root system.

This makes it hard to pull in its entirety.

It also spreads via airborne seeds, thus being able to travel longer distances and quickly find a home in thin lawns.

Similar to many of the other grass-like weeds, prevention by crowding out seeds is the most effective way to prevent these species from invading, which is why proper and regular lawn maintenance and improvement are always my best defense against lawn weeds.

Green foxtail

Green Foxtail - A Common Weed That Looks Like Grass
A mature Green Foxtail plant, which resembles grass – photo courtesy University of Missouri

This weed gets its name from the appearance of the mature heads that bloom on these grass-like stalks. The heads look like small fuzzy foxtails!

They can grow anywhere from 10cm to 100cm tall and are very common in prairies and meadows. Despite its cute name, it is an invasive species that can be quite problematic, especially for farmers, and a nuisance to lawn owners everywhere.

This hardy annual plant with hundreds of seeds per foxtail plume spreads easily, as these seeds can travel great distances with enough wind.

Despite how hardy these lawn weeds are once established, they are quite a picky species when it comes to germinating. They prefer moist soil and are easily crowded out by densely planted lawns or fields.

Green Foxtail also prefers warmer soil and will typically germinate when soil temperatures are 70-85 degrees Fahrenheit.

Like most lawn weeds, Green Foxtail can be controlled with some herbicidal solutions, but the best way to prevent this invasive species is by crowding it out with a thick, healthy lawn.

Smooth bromegrass

Smooth Bromegrass
Smooth Bromegrass – photo courtesy Univ. of Minnesota Extension

Another hardy perennial, Smooth Bromegrass, is highly adaptable and it is able to grow even in cold conditions and survive for quite a long time once established.

Like Nutsedge, Bromegrass can grow rhizomes underground through intricate root systems, which will help it to spread across your lawn quickly … especially if your lawn is thin.

These qualities make it an invasive species that can easily get out of control.

However, Bromegrass serves an important purposes as hay and grazing fields for livestock and it can also help to prevent soil erosion due to this strong root system.

Despite these qualities, most homeowners probably don’t want it in their lawn. To control and eliminate Smooth Bromegrass in your lawn, I recommend mowing it down low and attempting to crowd it out with a thick, healthy lawn canopy. In a worse-case scenario, you should opt for an application of herbicide designed to target this grass-like weed.

Slender rush

Slender Rush 3 Stages of Maturity - Weed that Looks like Grass
Slender Rush (3 stages of maturity) – photos courtesy Ohio State University

Also known as “poverty rush” or “path rush”, this grass-like perennial tends to grow in clumps, which is similar to crabgrass.

It is propagated by above-ground seeds as well as below-ground tubers that form with the help of the root system. The deeper root structure with rhizome propagation makes slender rush a particularly invasive species to get under control in lawns, because it can still be present even if you can’t necessarily see it yet.

Herbicides are not usually an effective way to control slender rush.

Manual weed management tends to be the most effective way of dealing with this invasive weed that looks like grass. This can involve pulling weeds by hand. Do so carefully, and be sure to get the root system as well.

The other options is a mowing routine that doesn’t allow for the plant to mature and spread seeds above ground.

Tall fescue

Tall Fescue as a Lawn Weed
Tall Fescue clump in Bermudagrass Lawn – photo courtesy Purdue University

You’ve likely heard this species discussed in the context of a grass, however it is an invasive perennial that has characteristics of a weed, particularly if your lawn is primarily a different type of turfgrass.

Similar to some of the other species discussed above, tall fescue has the ability to propagate via rhizomes underneath the ground. It is highly drought resistant, and in areas where it has been planted it has often taken over, crowding out other species of grass.

If you wanted to get rid of tall fescue grass that has run wild in your yard, you’d probably have to solarize it. Solarizing involves covering up large areas of grass to deprive it of sunlight and also increase the heat underneath the tarp so that it kills everything underneath.

Herbicides could also be used, but it would take a large amount which could get costly and be harmful to the environment, so I recommend solarizing tall fescue.

Restoring Lawn and Order

It’s interesting to compare various grass-like weeds and perennials that are less desirable than the perfectly manicured lawn.

Eliminating Weeds That Look Like Grass

List of Weeds That Look Like Grass

Careful selection of grass species is important in establishing a lawn.

It’s also possible to crowd out many of these invasive species by planting additional grass seed seasonally (overseeding) to create a thick and lush lawn.

Pre-emergent methods can also be an effective backup method of prevention, and using a pre-emergent every spring for several years as you overseed, fertilize, and use proper irrigation to improve your lawn can help to create that thick, dense lawn canopy that will prevent weeds from taking root in your grass.

Finally, spot treatment with the appropriate herbicide can nip any problematic weeds in the bud.

At Lawn Chick, I am committed to publishing accurate, useful, and trustworthy resources for my readers. As part of this commitment, I’ve invited subject matter experts to review our articles for accuracy. I invite you to read our editorial policy and publishing standards which outlines in detail how every article on this site is sourced, edited, fact-checked, and vetted.

-Sarah

Additional Resources
  • Tips for controlling crabgrass in your lawn by Shane Evans and Maggie Reiter, University of Minnesota Extension (link)
  • Nutsedge Factsheet by Karen Russ and Chuck Burgess, Clemson University Cooperative Extension HGIC (link)
  • Quackgrass by Aaron Patton and Quincy Law, Purdue University Department of Horticulture & Landscape Architecture (link)

by

Sarah Jameson’s blog, Lawn Chick, is read by over 2 million homeowners each year and she is regularly cited as an expert source of lawn care knowledge by major publications. Her goal is to meet you where you are, and help you achieve a yard you’ll be proud of. Ready to take the next step toward improving your lawn? Grab her free lawn care cheat-sheet: What to Do When - Take the Guesswork Out of Lawn Care, or upgrade your garage by browsing her favorite DIY lawn care products.

18 thoughts on “List of Common Weeds That Look Like Grass

  1. Brooke

    Need help with naming an invasive looking weed that has leaves that look like a rocket, long thick body with small wings. It’s overtaking my raised beds. I have a photo.

  2. Brian

    Hello Sarah,
    I have a few new spring weed grasses popping up that I didn’t see last year. Are you ok with sending the pics to your email for your opinion?

    Thank you
    Brian

  3. Sharleen

    Hi Sarah!
    I just discovered your website/posts while researching ‘weeds that look like grass’. I breed, raise and train springers which are flushing dogs. Recently, I came back from an excursion and one of my springers got a ‘grass thorn’ stuck in her paw. I always check for these things but somehow I missed this one. Nasty little thing but it was removed and after treatment, my dog was right-as-rain!
    I was researching lawns / grasses etc. as I’m planning to re-do my yard, making it more ‘dog friendly’. I was shocked to learn that Tall Fescue grass is considered an invasive weed on your website. This was the grass that was ‘highly recommended’ for those who have dogs. As I’m not keen on putting anything in that resembles bamboo in it’s underground system (I’ve had a 30 yr battle with this horrific stuff), can you suggest anything else? Any information you may provide would be greatly appreciated.

    • Hi, Sharleen!

      Thanks for the comment. Springers are great dogs!

      There are a LOT of different types of fescue, and as with any grass … what some consider a weed, others consider the foundation of a beautiful lawn. If you like the characteristics of fescue, I’d recommend you consider Turf Type Tall Fescue. It’s an improved variety designed for lawns and something I think you’ll be really happy with if you’re determined to go with a single type of grass for your yard.

      You can read more about all of your options for Fescue here, and I have a comparison of TTTF and Kentucky Bluegrass which you may find interesting here.

      You also may be interested in my article about how to grow grass with dogs that love to destroy it, which has some good tips on maintaining your lawn with four-legged friends. You can check that one out here.

      Finally, I’d suggest that it might be a good idea to get a blend of grass seed, with whatever you settle on as the primary seed. I’m in New England and my lawn is a mix of Perennial Ryegrass, Kentucky Bluegrass, and a few different fescues. Getting a seed blend that’s made for your area will give you good results, and provide good coverage in different areas of your lawn (full sun, part shade, shade, wet, dry, etc.). I think that’s easier to maintain than having to baby a single type of grass on parts of your property where growing conditions might not be ideal. With a blend of seed you allow different grasses to become dominant where the conditions are best suited for them, and your whole lawn looks and feels healthier.

      Hope this helps – good luck!

      • SHARLEEN

        Hi Sarah! Thank you so very much for all your help! This is the most information I have ever received! I love the idea of mixing grass seed … this could be a very good solution. My lawn is not very big … I have four ESS and of course they have worn paths to their various ‘barking stations’ ! The lawn is basically sunny and has thrived well. But, over time, some of the grass has worn despite my best efforts at ‘re-seeding’. I was relieved to learn that there are many types of Tall Fescue Grass. I would really like to see some great photos of lawns using this variety: google just doesn’t cut it!
        Again, thanks so much Sarah. I live in BC., Canada so our climate is quite different from yours. Fortunately, living in the southern part (coast), we experience quite a mild climate, lots of rain in the winter with very little snow and our summer highs almost never reach higher than 34C. I will take all your suggestions under advisement and begin my research pronto!

        Blessings,

        Sharleen

  4. Larry O.

    I have an area of lawn that has really compact soil, where a portion of the section gets scorching sun and the remainder is covered in shade. This year, I’ve tried growing Bermuda grass, but that is only taking somewhat in the sunny area. It has been so bad for so long that I’m now researching “weeds that look like lawns” that I can plant in this area and just be done with it! We are in central Virginia and have hot/humid summers and still some winter.

    Any ideas?

    • Hey, Larry!

      The transition zone can be tough for grass for some of the reasons you’ve outlined here. I’d try the Combat Extreme Transition Zone seed blend from Outside Pride. I’d plant it in September to give it the best chance of success so it can establish itself as things start to cool down in your area and it can build roots and come back strong and healthy for next season. The Outside Pride website has a calculator specific to this seed that will tell you exactly how much you’ll need to order and spread (I’d go a bit heavy, but that’s me). Here’s a link to an article with some resources to measure the lawn area you plan to re-seed so you’ll know exactly how much you need. I’d give this one (or one like it) a try before you throw in the towel. You need a good blend that can take sun and shade, and a fescue blend should be best for you as it’ll have the deep roots needed to withstand your summer heat.

      Good luck!

  5. Jay McGee

    Do you know what species prefer weeds to monocultures? All pollinators! Please consider why you feel you need a vast monoculture of grass in the first place.

  6. Frank Czapla

    I just happened upon your website, Sarah. Thank you for sharing your knowledge with those of us who want weeds diminished in our lawns. Is there a specific herbicide that we should consider in dealing with nutsedge? Thanks for your attention to this matter. Frank

    • Thanks, Frank!

      I’d try the Ortho Nutsedge product. It’s probably something that’s available locally, but you can also get it online (Amazon link). I like it because it comes ready-to-use in a hose-end sprayer. For those of us who don’t really like mixing herbicides, that’s a benefit.

      As with any herbicide, I recommend testing it out in a small area before you spray it all over your lawn just to be sure it’s effective and that it isn’t going to kill your turfgrass in addition to the Nutsedge and cause a big headache for you.

      Good luck!

  7. Jen M

    We’re trying to identify a grass-like plant in our lawn (we’re in New Hampshire). I think it looks like a flat circle of knives. Pretty, but not the nice soft grass you’d want to walk through barefoot.

    We have a picture that we can send.

  8. jack jenkins

    I HAVE A WEED THAT LOOKS LIKE CLOVER HAS A SMALL YELLOW FLOWER ON IT TRIED LAWN WEED AND CRABGRASS DID NOT HELP WHAT WILL KILL THE WEED

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