Crabgrass tends to show up just when you want your lawn looking its best. By the time summer hits, those tough, pale-green clumps can crowd out healthy grass and turn even well-cared-for lawns patchy. But while crabgrass is harder to get rid of midseason, there are practical ways to tackle it and prevent bigger problems next year. Below, you’ll find straightforward advice on identifying crabgrass, choosing the right treatment for your yard, and keeping it from gaining ground.
What Crabgrass Looks Like (and Why It Thrives in Summer)
Crabgrass, usually Digitaria sanguinalis or Digitaria ischaemum, is an annual weed that grows rapidly in sun and heat. It thrives in thin lawns or bare soil and spreads low to the ground by July and August. Compared to healthy turf, crabgrass is lighter and coarser, rooting at the nodes as it spreads. Once it starts setting seed in late summer, it gets even tougher to control, so early action makes a difference.
Spotting Crabgrass So You Can Act Early
Recognizing crabgrass in your yard is the first step to stopping it. Look for these features:
- Low, flat clumps spreading outward (almost like a “starburst”)
- Leaves are wide, light green, and rough
- Stems may have a purplish tint at the base
- Later in the season, look for finger-like seed heads
For comparison photos, university extension sites, such as Penn State Extension’s Crabgrass ID guide, provide reliable reference images.
Why Controlling Summer Crabgrass Is a Challenge
Most crabgrass sprouts in late spring, so by midsummer, plants are tougher and set deep roots. Pre-emergent weed preventers only work if applied before seeds sprout, usually in early spring. If you’re seeing crabgrass in July or August, you’ll need to use different products and techniques. Summer control isn’t as easy, but you can reduce existing plants and slow down seeding.
How to Kill Crabgrass in Summer: Step-by-Step
Choose your approach based on the size of the problem, the shape of your yard, and your preference for chemicals or manual control.
Post-Emergent Herbicides: For Active Crabgrass
How they work:
Post-emergent herbicides are designed to kill weeds that are already up and growing. For summer crabgrass, products containing quinclorac are often the standard. Read the label to make sure it’s safe for your grass type (such as Kentucky bluegrass, fescue, or zoysia).
How to use:
- Apply on a dry, calm day when temperatures are below 85°F to lower risk of damaging your lawn.
- Spot-treat patches with a pump or hose-end sprayer instead of covering the whole yard unless needed.
- Wait until the application is completely dry before letting people or pets back on the grass.
- Don’t mow right before or just after spraying.
Keep in mind:
- You may see wilting or color change within two weeks.
- Dense areas might need more than one treatment.
- Treating during heat or drought can add stress to your lawn.
Always follow all label instructions and safety advice.
Manual and Natural Methods: For Small Areas or Low-Impact Control
- Hand-pulling: Easiest after rain or watering, when soil is loose. Pull from the base to get as much root as possible. Bag pulled plants to keep seeds from spreading.
- Boiling water: Useful for crabgrass along driveways or in cracks, but not recommended for the main lawn, it kills everything it touches.
- Vinegar sprays: A stronger horticultural vinegar (not household strength) scorches leaves, but will also harm good grass if not used carefully. Spot-apply to isolated weeds.
Manual methods are time-consuming for larger patches, but work well for isolated crabgrass. Keep in mind, regrowth is possible if roots are left behind.
When to Treat (and When to Wait)
Timing matters for how well these approaches work:
- Early summer (June): Post-emergent sprays and hand-pulling both work well on new crabgrass.
- Mid-late summer (July–August): Herbicides are less effective on mature plants but can prevent seeding. Manual removal gets harder as roots deepen.
Post-emergent sprays slow seed production, so even if you don’t remove every clump this year, you make next year’s problem smaller.
Stopping Crabgrass from Coming Back
Successful treatment in summer helps, but preventing crabgrass starts with stronger turf. Here’s what makes a difference:
- Mow at a higher setting (3–4 inches) so grass shades out weed seeds.
- Water deeply but not too frequently; stressed, dry lawns open space to weeds.
- Fill bare spots with seed or patch mixes in early fall.
- Plan to apply a pre-emergent crabgrass preventer early next spring, before soil temperatures hit 55°F.
If crabgrass keeps coming back or you have a widespread problem, it’s often a sign the lawn could use thickening or soil care.
Making Lawn Care Easier with LawnGuru
Crabgrass control can be a time sink, especially in the busiest months. If you want results without juggling products and schedules, LawnGuru can help. Our platform connects you with top-rated local pros for lawn mowing, weeding, yard clean-up, and more. Book quickly, get instant price quotes based on your property, and follow every job in real time through our app.
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Crabgrass is a common summer headache, but you don’t have to tackle it alone or let it take over next year’s lawn. With the right treatments, and a little help from pros when needed, you can get your yard back on track. Need a hand with weeding or seasonal clean-up? Get a free quote from LawnGuru today and see how easy lawn care can be.
