How to Tell Crabgrass from Bermuda Grass
Bermuda grass is the dominant turf type in Frisco. Both it and crabgrass are warm-season grasses that turn green in late spring and brown in fall, which is why homeowners often confuse them until the crabgrass gets large enough to stand out.
A few differences make identification straightforward once you know what to look for:
Leaf blade: Bermuda has short, narrow blades with a fine texture. Crabgrass blades are noticeably wider and coarser, often 3 to 5 times broader than the surrounding Bermuda. Running your thumb across a crabgrass blade feels rougher and flatter.
Growth habit: Bermuda grows laterally through runners called stolons and spreads to fill gaps. Crabgrass grows outward from a central point in a star-burst pattern, lying low against the soil. The stems radiate like crab legs from the crown, which is where the common name comes from.
Color: Crabgrass tends to be a lighter, more yellow-green compared to the deeper green of established Bermuda. In summer heat, the contrast becomes more visible.
Seedheads: By August, crabgrass that has gone untreated produces finger-like seed spikes that spread in an unmistakable pattern. One mature plant can produce 150,000 seeds before the first frost.
If you see a grass that is coarser, paler, and spreading in a flat starburst pattern in your Bermuda lawn, it is almost certainly crabgrass.
Why Crabgrass Thrives in Frisco's Summer Heat
Crabgrass (Digitaria sanguinalis, smooth crabgrass, and Digitaria ischaemum, large crabgrass) are heat-loving annuals perfectly suited to Collin County summers. Soil temperatures above 55 degrees Fahrenheit trigger germination, which in North Texas typically happens between late February and early April, depending on the year. By the time Frisco sees triple-digit heat in June and July, crabgrass is thriving while competing turf grasses begin to show stress.
Three conditions in Frisco lawns favor crabgrass specifically:
Thin or damaged turf. Bermuda that went into winter stressed, was scalped too low, or has bare patches from pest or disease damage provides exactly the kind of open soil crabgrass seeds need. Dense, healthy turf shades the soil and physically crowds out germinating seeds.
Clay soil compaction. Frisco's Collin County clay compacts easily under foot and vehicle traffic, creating hard surface conditions where crabgrass outcompetes struggling turf. Compacted clay also holds surface moisture inconsistently, further stressing Bermuda while barely slowing crabgrass.
Overwatering or shallow irrigation. Frequent short irrigation cycles keep the top inch of soil consistently moist, which is ideal for crabgrass germination. Bermuda benefits from deeper, less frequent watering that encourages roots to go down rather than staying near the surface where crabgrass seeds compete.
Understanding these conditions matters because treatment alone does not solve a crabgrass problem. If the underlying turf health issue is not addressed, crabgrass comes back the following year from the seeds left behind.
Pre-Emergent Timing: The Most Important Window
Pre-emergent herbicides work by creating a chemical barrier in the top layer of soil that prevents crabgrass seeds from germinating. They do not kill established plants and have no effect on seeds that have already sprouted. Timing is everything.
In Frisco and the surrounding Collin County area, the target window for first pre-emergent application is late January through mid-February, before soil temperatures at a 4-inch depth reach 55 degrees consistently. This is earlier than national application guides typically recommend, because North Texas soils warm faster than those in northern states.
A few practical notes on pre-emergent application in Frisco:
The most common mistake is applying in March when the problem becomes visible. By March, many crabgrass seeds have already germinated in a warm year, and a pre-emergent applied then is largely wasted.
Most pre-emergents require rainfall or irrigation to activate after application. A product sitting dry on the surface does not form the soil barrier it needs to work. Plan applications around incoming rain or irrigate within 24 to 48 hours.
A second application 6 to 8 weeks after the first extends protection through the full germination season. Frisco summers are long enough that a single February application can break down before summer germination pressure is over.
For more detail on timing throughout the year, see the guide to pre-emergent weed control in Frisco, TX.
Treating Established Crabgrass
Once crabgrass has germinated and is actively growing, pre-emergent herbicides no longer apply. The options for established plants narrow, and none of them are as clean as stopping germination in the first place.
Post-emergent herbicides for crabgrass. Products containing quinclorac are the most widely used selective post-emergent treatments for crabgrass in Bermuda lawns. They work best on young plants in the 1- to 3-leaf stage. Older plants with more than 5 or 6 tillers (side shoots) require higher rates and may not be fully controlled in a single application.
Fenoxaprop is another active ingredient used in some professional products, though it tends to have stricter timing and temperature requirements. Both options are selective, meaning they target grassy weeds without injuring Bermuda when applied correctly. Applications to Zoysia or St. Augustine lawns require different products and label verification first.
Manual removal. For isolated plants, hand-pulling works if the soil is moist enough to get the crown and root system out intact. Crabgrass pulled after it has already produced seedheads is not worth the effort from a prevention standpoint; the seeds are already in the soil.
Late-season treatment reality. Crabgrass is an annual. A killing frost in November or December will kill the plants regardless of treatment. Treating mature crabgrass in August or September primarily serves to keep the plants from producing additional seeds. The benefit is real, but it is primarily an investment in next year's lawn, not this year's appearance.
What Crabgrass Does to Lawn Appearance
A lawn with moderate crabgrass is visually obvious. The light-green, coarse-textured patches interrupt the uniform surface of a healthy Bermuda lawn. In subdivisions with HOA standards, this is a recurring source of compliance notices during peak summer months.
The appearance impact compounds as crabgrass patches expand. A single plant left to mature can spread a foot or more outward by season end and deposit thousands of seeds in the surrounding soil. By fall, patches that started as isolated clumps can merge into continuous coverage across a section of lawn.
After crabgrass dies in winter, the dead brown material is particularly visible because it does not break down as quickly as the surrounding Bermuda dormancy. Frisco lawns with heavy crabgrass pressure often look patchier during the dormant season than lawns with established broadleaf or grassy weed problems.
When Bermuda re-establishes in spring, it typically fills back into areas where crabgrass died, but not always completely. Thin spots where crabgrass crowded out turf may require reseeding or plugging to recover fully before the next germination season.
To understand the full range of weeds common in Frisco lawns, including nutsedge, dallisgrass, and broadleaf varieties, see the common Frisco weeds guide.
5 Crabgrass Control FAQs for Frisco Homeowners
Q: When does crabgrass germinate in Frisco, TX?
A: In most years, crabgrass seeds in North Texas begin germinating when soil temperatures at 4 inches reach 55 degrees Fahrenheit, which typically falls between mid-February and late March depending on winter conditions. Warm winters can push germination earlier. The safest approach is to have pre-emergent applied by mid-February and not wait for visible signs of germination to start.
Q: Will my Bermuda grass grow back where crabgrass took over?
A: Generally yes, given enough time and reasonable soil conditions. Bermuda is an aggressive spreader that fills open ground through above-ground stolons. After crabgrass dies in late fall, Bermuda typically re-colonizes the area by midsummer of the following year. Areas with heavy compaction or depleted soil may be slower to recover and could benefit from aeration and light topdressing to speed recovery.
Q: Can I use weed-and-feed products to control crabgrass?
A: Products labeled as weed-and-feed typically contain broadleaf herbicides (for dandelions and clover) combined with fertilizer. Most do not contain the active ingredients needed to prevent or treat crabgrass. Check the label specifically for quinclorac, pendimethalin, or prodiamine if crabgrass control is the goal. Using the wrong product wastes time and money and delays effective treatment.
Q: Is it safe to apply pre-emergent herbicide around trees and shrubs in my Frisco yard?
A: Most granular pre-emergent products used for crabgrass are safe around established trees and shrubs when applied according to label directions. New plantings, seedlings, and any area where you intend to seed grass or plant annuals from seed should be avoided. Liquid pre-emergents vary more by product and label. If in doubt, a licensed applicator can advise on product selection for your specific landscape situation.
Q: How many treatments does it take to get crabgrass under control in Frisco?
A: In most cases, two pre-emergent applications (one in late January to mid-February, a follow-up in April) combined with post-emergent spot treatment on any plants that break through gives solid control in year one. Lawns with heavy seed banks from multiple years of uncontrolled crabgrass may need a second full season to show a significant reduction, since pre-emergents cannot eliminate seeds already in the soil. Each year of consistent pre-emergent application reduces the seed bank and makes the following year easier to manage.
For a complete overview of weed control options available to Frisco homeowners, visit the weed control services hub. The pre-emergent article has a detailed breakdown of product types, application rates, and Collin County timing that applies directly to crabgrass prevention.