The honest answer: It depends on how much actual grass you have versus weeds, and we’re going to be straight with you about this. If your lawn is 80% weeds and 20% grass, then yes, killing the weeds will leave you with significant bare areas. That’s not a reason to skip treatment. It’s a reason to have a realistic plan. Here’s the truth most lawn care companies won’t tell you upfront: if weeds are all that’s holding your yard together, those weeds need to go anyway. They’re competing with whatever grass remains, stealing water, nutrients, and sunlight. Leaving them just delays the inevitable while making the problem worse. The right approach is to eliminate the weeds AND have a recovery strategy for what comes next. A yard full of weeds isn’t a healthy lawn. It’s a lawn that needs rebuilding, and that process starts with removing what doesn’t belong.
First, let’s assess what you actually have.
When homeowners say their yard is “all weeds,” it usually falls into one of these categories:
Mostly weeds with some grass (70-90% weeds). This is the situation that concerns people most. Yes, treating the weeds will create bare areas. But the grass that remains will have room to spread once it’s not competing with weeds. Recovery is possible, but it takes time and the right approach.
Heavy weed pressure with decent grass underneath (40-60% weeds). More common than people realize. The weeds are visible and alarming, but there’s actually a reasonable grass population hiding underneath. Once weeds are removed, the existing grass fills in faster than expected, especially Bermuda, which spreads aggressively.
Scattered weeds that seem worse than they are (20-40% weeds). Weeds are visually prominent, especially broadleaf weeds with large leaves or weeds that stand taller than the grass. The lawn looks terrible but actually has a solid grass foundation. Treatment results in some thin spots but overall good recovery.
Truly all weeds, no grass (90%+ weeds). This is rare, but it happens, especially in neglected properties or new construction. In this case, weed treatment is just step one. You’re essentially starting from scratch and will need to establish new turf through seeding or sodding.
Why Killing the Weeds Is Still the Right Move
Even if treatment creates bare spots, here’s why it’s necessary:
Weeds are actively killing your grass. Every weed in your lawn is competing with grass for water, nutrients, and sunlight. The longer weeds stay, the weaker your remaining grass becomes. Weeds don’t coexist peacefully. They win by outcompeting.
Weeds are producing seeds constantly. A single dandelion produces up to 15,000 seeds. Crabgrass produces up to 150,000 seeds per plant. Every day you wait, more seeds are being deposited into your soil, making future control harder.
Grass can’t recover until weeds are gone. You can fertilize all you want, but if weeds are taking those nutrients, your grass won’t benefit. Recovery starts when competition ends.
Bare dirt is temporary. Weed takeover is progressive. Bare spots after weed treatment can be addressed through overseeding, sprigging, or natural spread (for Bermuda). But if you leave the weeds, they spread further every year. The problem gets worse, not better.
What Actually Happens After Weed Treatment
Here’s the realistic timeline for a heavily weeded Tulsa lawn:
Weeks 1-2: Weeds begin dying. Broadleaf weeds curl, yellow, and wilt. This is when the lawn often looks its worst because dying weeds are visually prominent. Don’t panic. This is progress.
Weeks 2-4: Dead weeds decompose or can be removed. Now you can see what you’re actually working with. The bare spots are visible, but so is the grass that was hiding under the weed canopy.
Weeks 4-8: Existing grass begins spreading (Bermuda). With competition removed, Bermuda grass spreads via stolons and rhizomes to fill bare areas. Proper fertilization accelerates this. You’ll see runners reaching into bare spots.
Months 2-4: Significant filling (warm season). During the active growing season (May through September in Tulsa), Bermuda fills in aggressively. What looked like a disaster in May can look dramatically better by August.
One full season: Substantial recovery. A lawn that was 60-70% weeds can often recover to 80-90% grass coverage within one growing season if properly treated and fertilized. Severely damaged lawns may need overseeding or sprigging to accelerate recovery.
The Recovery Plan: What Needs to Happen After Weeds Are Gone
Killing weeds is step one. Here’s what supports recovery:
Proper fertilization. Now that grass isn’t competing with weeds, fertilizer actually benefits your turf. Proper nutrition encourages spreading and thickening.
Correct watering. Grass spreading into bare areas needs adequate moisture. Deep, infrequent watering encourages root development.
Proper mowing height. Mowing at the right height for your grass type encourages lateral spread. Too short stresses the grass. Too-tall shades out new growth.
Pre-emergent to prevent new weeds. Those bare spots are vulnerable to weed seeds. Pre-emergent creates a barrier so new weeds don’t move in while grass is filling the space. Timing this correctly is critical.
Overseeding or sprigging if needed. For severely damaged lawns or fescue lawns (which don’t spread like Bermuda), overseeding introduces new grass plants to fill bare areas faster.
Bermuda vs. Fescue: Different Recovery Paths
Your grass type significantly affects recovery expectations:
Bermuda grass (most common in Tulsa): Bermuda is aggressive and spreads via above-ground stolons and below-ground rhizomes. Given proper conditions, it actively fills bare spots. A Bermuda lawn with 30-40% grass coverage after weed treatment can often recover without overseeding, just through natural spread during the growing season.
Fescue grass: Fescue is a bunch-type grass that doesn’t spread. Each plant stays where it is. Bare spots in fescue lawns won’t fill in on their own. They require overseeding, ideally in fall when soil temperatures support fescue germination. Recovery takes longer and requires more active intervention.
What If It Really Is All Weeds?
For lawns that truly have no salvageable grass, the approach is different:
Kill everything and start fresh. Sometimes the best approach is a complete renovation. Kill all vegetation, address any soil issues, and establish new turf through seeding or sodding.
Test your soil first. Before investing in new grass, understand what you’re working with. Soil pH, nutrient levels, and compaction all affect whether new grass will succeed. Fix soil problems before planting.
Choose the right establishment method. Sodding provides instant coverage but costs more. Seeding costs less but takes longer and has a narrower timing window. Sprigging (for Bermuda) falls in between.
Have realistic expectations. A complete lawn renovation takes one to two full growing seasons to mature. The first year establishes the grass. The second year thickens it into a proper lawn.
Questions to Ask Your Lawn Care Provider
Before starting treatment on a heavily weeded lawn, get honest answers:
“What percentage of my lawn is actually grass versus weeds?” A good provider will assess this honestly, not just promise everything will be fine.
“What should I expect after treatment?” They should tell you if bare areas are likely and how significant they might be.
“What’s the recovery plan?” Killing weeds is just step one. What happens next to rebuild the lawn?
“How long until my lawn looks good?” Honest answer: probably not this month. Maybe not this season. But next year can be dramatically better.
Honest Assessment, Realistic Expectations, Science-Based Recovery
For more than 25 years, Complete Lawn Care has been a trusted lawn care provider in the Tulsa area. We believe great results don’t come from guessing. They come from experience, science, and continual improvement.
That’s why we invest heavily in leadership training, research and development, and product testing, ensuring our team stays current on the latest turf products, application methods, and correction strategies. We’ve also implemented one of the few agronomy-supported programs in Tulsa, working directly with an industry expert who helps guide our application timing, product selection, and ongoing improvements based on proven agronomic science.
When you call us about a lawn that’s overrun with weeds, we’ll give you an honest assessment. We’ll tell you what to expect after treatment, including the reality that there may be bare spots. We’ll explain the recovery plan and timeline. We won’t promise overnight transformation because that’s not honest. What we will promise is a path forward based on what actually works.
We also offer soil testing to understand what your soil needs to support healthy grass. Sometimes the reason weeds took over is because soil conditions favored them over turf. Fixing the underlying problem prevents the cycle from repeating.
Experience tells us what to do. Science tells us when and why. Your lawn deserves the best.
The Bottom Line
Yes, killing weeds in a heavily weeded lawn creates bare spots. That’s reality, and we won’t pretend otherwise.
But those weeds have to go. They’re killing your grass and getting worse every day.
Bare spots are temporary. Weed takeover is progressive. One can be fixed. The other only gets worse.
The right approach combines weed removal with a recovery plan. Killing weeds is step one, not the whole solution.
Ready for an Honest Assessment?
At Complete Lawn Care, we’ll look at your lawn and tell you the truth about what you’re working with. We’ll explain what to expect from treatment, outline the recovery plan, and give you a realistic timeline. If your lawn needs more than our standard program, we’ll tell you that too.
Our 7-step program is designed for lawns that need ongoing maintenance and improvement. For severely damaged lawns, we can discuss renovation options. Either way, you’ll know exactly what you’re getting into before we start.
Phone: (918) 605-4646
Email: [email protected]
Online: completelawncaretulsa.com/get-a-quote
Proudly serving Tulsa, Broken Arrow, Owasso, Jenks, Bixby, Sand Springs, Collinsville, and surrounding Oklahoma communities since 2000.