Stepped outside lately and noticed some weird, wide-bladed grass pushing through your lawn in thick, star-shaped clumps? There's a good chance you're looking at crabgrass — and right now, in late May and early June, it is absolutely in its prime across Nashville, Charlotte, Atlanta, Greenville, and Dallas-Fort Worth.
Crabgrass is one of those weeds that waits all winter underground as a seed, then explodes the moment conditions are right. And this time of year? Conditions are very right. Here's what's actually going on in your lawn and what you can do about it.
Crabgrass (Digitaria spp.) is a warm-season annual grassy weed, meaning it completes its entire life cycle in a single growing season. It germinates in late spring once soil temperatures climb above 55–60°F, which happens fast in the Southeast, then grows aggressively all summer, produces thousands of seeds, and dies with the first hard frost. But before it dies, it drops all those seeds right back into your soil, setting up next year’s invasion.
There are two types you’ll commonly encounter in the Southeast: large crabgrass and smooth crabgrass. Large crabgrass is the bigger troublemaker: wider leaves, slightly hairy texture, and thick clumps that sprawl outward low to the ground like, well, the legs of a crab (hence the name). Smooth crabgrass is a bit smaller but just as stubborn.
One thing both types have in common: they’re excellent at surviving your lawn mower. Because they grow outward rather than upward, the mower blade passes right over them most of the time without doing much damage at all.
Crabgrass is one of those weeds that becomes pretty obvious once you know what you’re looking for.
Look for light green to yellowish-green clumps that stand out against your regular turf. If you have Bermuda or Zoysia, both common in our region, the color contrast is especially noticeable, since those grasses tend to be finer-bladed and a darker, richer green. Crabgrass blades are noticeably wider, often 4–8 millimeters across, with a coarser texture.
The clumps fan out low in a rosette or star pattern from a central point. As the season progresses, thin, finger-like seed heads will shoot up from the plant’s center in a radiating spike pattern. Once you see those seed heads, the plant is already loading next year’s ammunition into your soil.
Also worth knowing: crabgrass loves stressed and thin turf. Check along driveways, sidewalks, compacted spots, and any area where your lawn is thin or bare. Those are its favorite entry points.
Here’s an honest reality check: the ideal window to stop crabgrass was a few weeks ago.
Pre-emergent herbicides work by creating a chemical barrier in the soil that prevents crabgrass seeds from germinating. They’re most effective when applied before soil temps hit that 55–60°F threshold, which in Nashville and Charlotte typically means late February to early March, and even earlier in Atlanta and DFW. If your lawn care company applied a pre-emergent this spring, it’s been working in the background on your behalf.
But if you’re seeing crabgrass now, some got through. That can happen when there are thin spots in coverage, gaps along edges, or if no pre-emergent was applied.
That’s where post-emergent herbicides come in. Products containing active ingredients like quinclorac or fenoxaprop-p-ethyl can knock out crabgrass that has already germinated, but with one important catch: they work best on young plants, ideally those with fewer than four tillers (the small side shoots that develop as crabgrass matures). Once the plant is full-grown and setting seed, post-emergent results become much less reliable.
So if you’re seeing it now, don’t wait. Young plants are your best window for control.
Technically, yes — hand-pulling crabgrass is an option. But it’s not as satisfying as yanking a dandelion.
Crabgrass has shallow, fibrous roots that spread along the soil surface, and if the plant is even slightly mature, pulling it can disturb the soil and create a bare patch, which is basically a welcome mat for more crabgrass. Hand-pulling makes sense for a few isolated plants in an otherwise healthy lawn.
For anything more than that, herbicide treatment is more effective and, honestly, a lot less back-breaking.
One important note: if the crabgrass is already producing seed heads, don’t throw the pulled plants into your yard debris pile. Bag them and put them in the trash. Those seeds can still germinate even after the plant has been pulled.
Here’s the thing most homeowners don’t hear enough: a dense, vigorous lawn is the single most effective weapon against crabgrass. Crabgrass needs bare or thin soil to germinate. When your Bermuda, Zoysia, or Tall Fescue is thick and actively growing, it shades the soil surface and physically crowds out crabgrass seedlings before they can get their footing.
That’s why regular fertilization, proper mowing height, and core aeration aren’t just “nice to have”, they’re part of your weed prevention strategy. A well-fed lawn growing at the right height naturally suppresses weeds like crabgrass year after year.
If your lawn has bare patches from grub damage, drought stress, or disease, those spots will keep attracting crabgrass until you address them. Fall is a great time to overseed thin fescue lawns in our region. For Bermuda and Zoysia, filling bare spots with sod plugs or a targeted renovation plan can work wonders.
Managing crabgrass well means knowing your grass type, catching the pre-emergent window at the right time each year, and responding quickly when something does break through. That’s a lot to keep track of when life gets busy.
Top Turf’s lawn Fertilization and Weed Control Program is built around exactly this kind of proactive, seasonal approach: properly timed pre-emergent applications, post-emergent follow-ups when needed, and the local knowledge to know what’s happening in Atlanta lawns versus Charlotte lawns versus DFW lawns, because the timing really does matter.
If crabgrass is already showing up in your yard, now is the time to call in a pro before it sets seed and multiplies for next season. Get in touch with Top Turf today, and let’s take back your turf.