Other Names For Crabgrass – Identify And Conquer This Common Lawn
Do you ever look out at your lawn and feel a sense of frustration at those coarse, sprawling clumps of weeds? You are certainly not alone, as almost every gardener faces this opportunistic plant at some point. Knowing the other names for crabgrass is the first step in identifying exactly what is invading your turf so you can take action.
In this guide, I will help you recognize this persistent weed regardless of what your local community calls it. We will explore its biological characteristics, its common nicknames, and the most effective ways to remove it for good. Don’t worry—with a little bit of knowledge and the right timing, you can reclaim your beautiful green carpet!
By the end of this article, you will be an expert in spotting this summer annual and managing it like a professional. We will dive deep into the specific species and the regional variations that often confuse homeowners. Let’s get started on your journey to a weed-free lawn that will be the envy of the neighborhood.
What's On the Page
- 1 Understanding the Many Other Names for Crabgrass
- 2 The Biological Breakdown: Large vs. Smooth Species
- 3 Why Identification Matters for Your Lawn Care Routine
- 4 Differentiating Crabgrass from Common Look-alikes
- 5 Effective Strategies to Manage Crabgrass Infestations
- 6 Preventative Care: Stopping the Cycle Before it Starts
- 7 Frequently Asked Questions About other names for crabgrass
- 8 A Final Word on Reclaiming Your Lawn
Understanding the Many Other Names for Crabgrass
Crabgrass is a member of the Digitaria genus, which contains over 300 species of grasses. Because it is found all over the globe, people have developed various ways to describe it. In many parts of the world, it is referred to by names that describe its physical appearance or its growth habits.
One of the most frequent other names for crabgrass you will encounter is “Finger Grass.” This name comes from the way the seed heads branch out from the top of the stem. They look remarkably like the fingers on a hand, reaching out to spread their seeds across your soil.
In some agricultural circles, you might hear it called “Polish Millet.” This is because certain species were historically used as a grain crop in parts of Europe. While it might be a food source in some cultures, for most of us, it is simply a nuisance that steals nutrients from our desired grass.
Another common nickname is “Crowfoot Grass.” If you look closely at the seed stalks, they resemble the sprawling footprint of a large bird. This visual cue is one of the easiest ways to distinguish it from other grassy weeds that might be popping up in your garden beds.
In the Southern United States, some gardeners simply refer to it as “Summer Grass.” Since crabgrass is a warm-season annual, it only appears when the weather gets hot. It thrives in the sweltering heat of July and August, exactly when your cool-season lawn might be starting to struggle.
The Biological Breakdown: Large vs. Smooth Species
To truly master your lawn care, you should know that there isn’t just one type of crabgrass. The two most common types found in residential lawns are Large Crabgrass and Smooth Crabgrass. Both are aggressive, but they have slight physical differences that are helpful to note.
Large Crabgrass (Digitaria sanguinalis)
Large crabgrass is also known as “Hairy Crabgrass” because of the distinct fuzz on its leaves and sheaths. If you run your finger along the blade, it will feel slightly pubescent or hairy. This species can grow quite tall if left unmowed, sometimes reaching up to two feet in height.
It tends to have a reddish or purple tint at the base of the stems, which is a telltale sign. This species is particularly hardy and can survive in very poor, compacted soil. It is often the first weed to colonize bare spots where the soil has been disturbed or left unprotected.
Smooth Crabgrass (Digitaria ischaemum)
As the name suggests, Smooth Crabgrass lacks the hairy texture of its cousin. It is generally smaller and has a more prostrate growth habit, meaning it stays closer to the ground. This makes it harder to catch with a lawnmower blade, allowing it to go to seed even in low-cut turf.
While it lacks the hairs, it still possesses the same “finger-like” seed heads. It is just as prolific as the large variety, with a single plant capable of producing thousands of seeds. Understanding these nuances helps you realize why a “one size fits all” approach to weeding doesn’t always work.
Why Identification Matters for Your Lawn Care Routine
Identifying the other names for crabgrass and its specific type is crucial because it dictates your treatment window. Crabgrass is an annual, meaning it grows from a seed, matures, drops more seeds, and dies all within a single year. It does not come back from the roots the following spring.
If you mistake it for a perennial weed like Quackgrass, you might use the wrong herbicide or technique. Perennial weeds require systemic killers that reach the roots, whereas crabgrass management is all about seed prevention. If you stop the seeds from germinating, you win the battle before it even starts.
Knowing your enemy also helps you understand the “55-degree rule.” Crabgrass seeds begin to germinate when the soil temperature reaches a consistent 55 degrees Fahrenheit for several days. This usually coincides with the blooming of Forsythia bushes in the springtime.
If you are using a pre-emergent barrier, you must apply it before this temperature threshold is met. Once you see the “fingers” of the crabgrass appearing, the window for pre-emergents has closed. At that point, you have to switch to post-emergent strategies or manual extraction.
Differentiating Crabgrass from Common Look-alikes
Many gardeners get frustrated when their weed treatments don’t work, only to realize they weren’t dealing with crabgrass at all. Several other weeds mimic the appearance of Digitaria species. Learning to tell them apart will save you time, money, and a lot of heartache.
Goosegrass (Eleusine indica)
Goosegrass is often confused with crabgrass because it also grows in a flattened rosette shape. However, Goosegrass is much tougher and has a distinct white or silver center. It thrives in heavily compacted soil, such as the edges of driveways or high-traffic paths.
Unlike crabgrass, Goosegrass stems are stronger and harder to pull out by hand. Its seed heads are also thicker and more “zipper-like” in appearance. If your “crabgrass” isn’t dying after a standard treatment, check for that telltale silver center—it might be Goosegrass instead.
Dallisgrass (Paspalum dilatatum)
Dallisgrass is a perennial weed, which makes it much harder to control than annual crabgrass. It grows in thick, bunchy clumps and has very long seed stalks with black spots on the seeds. Because it is a perennial, it will grow back from the same root system every year.
If you try to treat Dallisgrass with a standard crabgrass killer, you will likely see very little success. Dallisgrass requires much more aggressive treatment, often involving non-selective herbicides or deep digging. Always check the growth habit; if it survives the winter, it isn’t crabgrass.
Foxtail (Setaria spp.)
Foxtail is another summer annual that looks like a grass, but its seed head is very different. Instead of the “finger” shape, it produces a fuzzy, cylindrical spike that looks like a fox’s tail. These are common in hay fields but frequently find their way into residential lawns.
While the control methods for Foxtail and crabgrass are similar, the identification is important for monitoring your lawn’s health. Foxtail often indicates that your soil is overly moist or has poor drainage. Correcting the underlying soil issue is the best long-term solution for this weed.
Effective Strategies to Manage Crabgrass Infestations
When searching for other names for crabgrass, you are likely looking for a way to get rid of it. If the weed has already established itself in your lawn, don’t panic. There are several ways to handle the situation depending on your gardening philosophy and the size of the invasion.
The most immediate method is manual removal. This is best done after a heavy rain when the soil is soft and pliable. Use a weeding tool to get under the crown of the plant and lift the entire root system out. Be careful not to shake the plant, as you might disperse seeds that are ready to drop.
If the infestation is too large for hand-pulling, you may need a post-emergent herbicide. Look for products containing Quinclorac, which is highly effective against young crabgrass. Always follow the label instructions exactly, as applying chemicals in high heat can stress or kill your desirable grass.
For those who prefer organic methods, a mixture of horticultural vinegar can work, but be warned: it is non-selective. This means it will kill any green plant it touches, including your lawn. Spot treatment is essential when using organic acids to ensure you don’t end up with large brown dead zones.
Another “pro” tip is to use boiling water on weeds growing in pavement cracks. It is a safe, chemical-free way to cook the plant and its seeds instantly. Just be sure to wear sturdy shoes and pour carefully to avoid splashes. This is perfect for those pesky weeds that grow right against the foundation of your home.
Preventative Care: Stopping the Cycle Before it Starts
The best way to manage any weed is to ensure your lawn is so healthy that the weeds have no room to grow. Crabgrass is an “opportunistic” weed; it only thrives where the grass is thin, stressed, or cut too short. A thick, lush lawn is the best natural defense you have.
One of the simplest changes you can make is adjusting your mowing height. Set your mower to its highest setting, usually around 3 to 4 inches. Taller grass shades the soil, which prevents sunlight from reaching the crabgrass seeds. Without sunlight, those seeds cannot germinate.
Proper watering is also key to prevention. Instead of light, daily sprinkling, aim for deep and infrequent watering. This encourages your grass to grow deep roots, making it more resilient. Shallow-rooted weeds like crabgrass struggle to survive when the surface of the soil dries out between waterings.
Don’t forget to aerate your soil in the fall. Compacted soil is a playground for weeds because it prevents water and oxygen from reaching the roots of your grass. By aerating, you break up the soil and give your turf the “breathing room” it needs to grow thick and strong.
Finally, consider using a pre-emergent barrier in the early spring. Corn gluten meal is a great organic option that provides a boost of nitrogen while inhibiting seed germination. Just remember that timing is everything; once you see the weed, the pre-emergent will no longer be effective.
Frequently Asked Questions About other names for crabgrass
Is “Water Grass” the same thing as crabgrass?
Yes, “Water Grass” is one of the very common other names for crabgrass used by homeowners. This name likely arose because crabgrass often appears more vibrant and green than the rest of the lawn during a drought. It seems to “suck up” all the available water, leaving your turf thirsty.
Can crabgrass grow in the shade?
Crabgrass is a sun-loving plant and typically struggles in deep shade. If you see a grassy weed in a shaded area, it is more likely to be Nimblewill or a type of Bentgrass. Improving light penetration or planting shade-tolerant grass varieties will usually naturally eliminate crabgrass in those areas.
Does vinegar really kill crabgrass?
Standard household vinegar is usually too weak (5% acidity) to kill a mature crabgrass plant. You would need horticultural vinegar (20% to 30% acidity) for it to be effective. However, use it with extreme caution as it is non-selective and will damage any vegetation it contacts.
Why is it called crabgrass?
The name comes from the plant’s growth habit. The stems radiate outward from a central point, looking much like the legs of a crab. This low-profile, sprawling shape allows it to spread quickly over bare soil and avoid the blades of most standard lawnmowers.
How many seeds does one plant produce?
A single healthy crabgrass plant can produce anywhere from 15,000 to 150,000 seeds in a single season. This is why it is so important to remove the plants before they reach the seeding stage. Those seeds can remain viable in your soil for several years, waiting for the perfect conditions to sprout.
A Final Word on Reclaiming Your Lawn
Dealing with weeds can feel like a never-ending battle, but remember that every step you take toward a healthier lawn is a step toward victory. Whether you call it finger grass, crowfoot, or use the other names for crabgrass, the solution remains the same. Focus on soil health, proper mowing, and timely prevention.
Don’t be discouraged if a few clumps pop up here and there. Even the most experienced gardeners deal with these invaders from time to time. The key is to stay consistent and not let the weeds go to seed. Over time, your lawn will become so dense and healthy that crabgrass won’t stand a chance.
I hope this guide has given you the confidence to identify and manage this common garden foe. Your outdoor space is a place for relaxation and joy, not stress. Take these tips into your garden this weekend and start showing those weeds who is the boss! Go forth and grow!
