Here’s the brutally honest truth: If you sign up for lawn care in March or later in Tulsa, you’ve already missed the most critical window for weed prevention—and there’s no magic product we can spray to fix that. Weeds germinate at different times throughout the year, and the ones that germinate in late winter (henbit, chickweed, and Poa annua) and early spring (crabgrass) have already started growing by the time March rolls around. At Complete Lawn Care, we’ve been serving Tulsa for 25+ years, and we have to have this uncomfortable conversation with homeowners who sign up mid-season: We can battle those existing weeds with post-emergent herbicides all season long, and your lawn will definitely look better—but you won’t see the REAL benefit until next year after we’ve applied fall pre-emergent (September/October) and early spring pre-emergent (January/February). Those pre-emergent applications create a barrier in the soil that prevents weed seeds from germinating in the first place. Miss those windows, and you’re fighting an uphill battle all year. And here’s the other part people forget: lawn care isn’t just about what we put down—proper watering and proper mowing (weekly, with sharp blades, at the correct height) are just as important. If you’re scalping your lawn or watering wrong, even the best treatments can’t overcome bad homeowner practices.
If you’re in Tulsa, Broken Arrow, or Owasso and you’re thinking about signing up for lawn care, this guide explains why timing matters and what realistic expectations look like based on when you start.
The Pre-Emergent Window: What You Miss When You Sign Up Late
Let’s start with understanding the most critical treatments of the year.
Pre-Emergent vs. Post-Emergent: The Critical Difference
Pre-Emergent Herbicide
- Applied BEFORE weeds germinate
- Creates a barrier in the top layer of soil
- Prevents weed seeds from developing roots when they try to germinate
- Timing is everything: Must be applied before soil temps trigger germination
- Effectiveness: 90-95% prevention when timed correctly
- Think of it as: Birth control for weeds (prevents them from establishing)
Post-Emergent Herbicide:
- Applied AFTER weeds have already emerged
- Kills existing weeds that are already growing
- Requires multiple applications for tough weeds
- Much less efficient: Fighting visible weeds instead of preventing them
- Effectiveness: 70-90% kill rate, but weeds keep germinating from the seed bank
- Think of it as playing whack-a-mole all season.
The bottom line: Pre-emergent prevents the problem. Post-emergent fights the problem after it’s already started.
The Tulsa Weed Germination Calendar: When Different Weeds Actually Start
Here’s what’s happening in your soil throughout the year.
Late Fall/Early Winter (November-January):
Weeds germinating:
- Henbit
- Chickweed (common and mouse-ear)
- Deadnettle
- Annual bluegrass (Poa annua)
What this means:
- These are called “winter annuals” or “cool-season weeds.”
- Seeds germinate when soil temps drop into the 50s-60s (fall).
- Plants grow slowly through winter.
- Explode with growth in early spring (March-April)
- Critical window: Fall pre-emergent (September/October) prevents these
If you sign up in March:
- These weeds have been growing since November.
- Pre-emergent won’t work (they’re already established).
- We’ll have to kill them with post-emergent (takes weeks, multiple applications).
Early Spring (February-April):
Weeds germinating:
- Crabgrass (starts germinating when soil hits 55°F for 3-5 consecutive days)
- Goosegrass
- Foxtail
- Spurge
What this means:
- These are “summer annuals” or “warm-season weeds.”
- Seeds germinate in late winter/early spring.
- Grow rapidly as temps warm
- Take over lawns by June-July if not prevented
- Critical window: Early spring pre-emergent (January/February) prevents these
If you sign up in March:
- Early germinators are already sprouting (especially in warm February years).
- Pre-emergent effectiveness is reduced (some seeds have already germinated).
- You’ll see breakthrough crabgrass by May-June.
- We can still apply pre-emergent, but it’s not as effective as it would have been in January.
Late Spring/Summer (May-August):
Weeds germinating:
- Second flush of crabgrass (from later-germinating seeds)
- Nutsedge (not prevented by typical pre-emergent)
- Spurge continues
- Broadleaf summer weeds (various)
What this means:
- Active weed season
- Post-emergent applications are our only option.
- Heat stress on turf makes weed control harder.
- This is “battle mode” if you didn’t get pre-emergent down early.
If you sign up in May-August:
- You’ve missed BOTH pre-emergent windows.
- We’re in full post-emergent mode for the rest of the season.
- Your lawn will improve, but it’s constant fighting.
- Plan to commit through next year to see real prevention results
What Happens When You Sign Up in March: The Reality
Let’s walk through exactly what your experience will be.
March Sign-Up Scenario:
What you’ve already missed:
- Fall pre-emergent (September/October) that would have prevented winter weeds
- Early spring pre-emergent (January/February) that would have prevented crabgrass
What’s already growing in your lawn (by March):
- Henbit (blooming purple, taking over)
- Chickweed (thick mats in thin areas)
- Poa annua (lighter green patches, going to seed)
- Early crabgrass (just starting to germinate in warm spots)
What we CAN do:
Application 1 (March):
- Apply post-emergent to kill existing winter weeds (henbit, chickweed, Poa annua).
- Apply pre-emergent for remaining crabgrass (some protection, but not complete).
- Fertilize to thicken turf
What you’ll see:
- Existing weeds start dying over 2-3 weeks.
- Lawn looks better as winter weeds die off
- But: More weeds will emerge (we didn’t prevent them).
Application 2-6 (April-September):
- Continued post-emergent applications as breakthrough weeds appear
- Fertilization for turf health
- Fighting weeds reactively all season
What you’ll experience:
- The lawn looks significantly better than before you hired us.
- But you’re still seeing weeds pop up.
- We keep coming back to spray them (service calls included).
- It’s frustrating because you’re paying for service but still seeing weeds.
- This is normal when starting mid-season.
Application 7 (Fall – September/October):
- CRITICAL: Fall pre-emergent application
- This prevents next year’s winter weeds.
- First step toward next year’s success
What to expect for the rest of Year 1:
- Lawn goes dormant, looking better than it did in March
- But it wasn’t the “weed-free lawn” you hoped for.
- That’s because we spent the year fighting, not preventing.
What Changes in Year 2: Why You’ll Finally See the Results You Wanted
This is why sticking with the program matters.
Year 2 Timeline (If You Stick With It):
Fall (September/October – Year 1 carryover):
- Pre-emergent applied for winter weeds
- This time we’re AHEAD of the problem.
Early Spring (January/February – Year 2):
- Pre-emergent applied for crabgrass
- Again, we’re preventing instead of fighting.
Spring/Summer (March-August – Year 2):
- Minimal weeds (pre-emergent worked!)
- Occasional post-emergent spot treatments (normal)
- The lawn looks DRAMATICALLY better than Year 1.
- You’re finally seeing what prevention looks like.
Why Year 2 is so much better:
- ✅ Pre-emergent was applied at correct times (fall and early spring).
- ✅ Weed seed bank is reduced (Year 1 weeds didn’t go to seed)
- ✅ Turf is thicker (crowds out weeds naturally)
- ✅ Prevention > Fighting
This is what you signed up for. But you had to go through Year 1 first.
The “Magic Sauce” Myth: Why We Can’t Just Spray Something to Fix It Mid-Season
Homeowners often ask, “Can’t you just spray something stronger?”
The Reality:
There is NO post-emergent herbicide that:
- Prevents future weeds from germinating
- Works as well as pre-emergent
- Lasts for months
- Eliminates the need for multiple applications
Post-emergent herbicides:
- Kill existing weeds only
- Must contact the weed to work
- Don’t prevent new germination.
- Need reapplication as new weeds emerge
The only “magic sauce” is time + proper timing:
- Fall pre-emergent
- Early spring pre-emergent
- Consistent turf management
- Applied for 2-3 years in a row
If someone promises to “fix it all with one treatment,” they’re lying.
The Other Half of the Equation: Proper Watering and Mowing
Here’s the part people forget: our treatments are only 50% of lawn success.
Proper Watering (Your Responsibility):
What “proper watering” means:
- 1 inch of water per week total (rain + irrigation)
- Deep and infrequent (not daily shallow watering)
- Early morning (4am-9am ideal)
- Adjust based on rainfall
How bad watering undermines our treatments:
❌ Over-watering:
- Washes fertilizer away before turf can absorb it
- Creates favorable conditions for disease
- Promotes shallow roots (weak turf)
- Encourages weeds like Poa annua and nutsedge
❌ Under-watering:
- Turf stress (can’t recover from heat, traffic, or treatments)
- Thin turf (invites weed invasion)
- Fertilizer can’t activate properly.
Even perfect treatments can’t overcome bad watering habits.
Proper Mowing (Your or Your Mower’s Responsibility):
What “proper mowing” means:
Mowing Height:
- Bermuda grass: 1.5-2 inches
- Tall fescue: 3-4 inches
- Never remove more than 1/3 of blade height in a single mowing.
Mowing Frequency:
- Weekly during growing season (April-October)
- Every 10-14 days during slow growth periods
Blade Sharpness:
- Blades sharpened every 10-20 mows minimum
- Dull blades tear grass (not cut) → disease susceptibility
How bad mowing undermines our treatments:
❌ Scalping (mowing too short):
- Weakens turf (shallow roots, stress)
- Opens door for weed invasion
- Undoes all our hard work making turf thicker
❌ Infrequent mowing:
- Removes too much blade height at once (stresses plant)
- Creates thatch buildup
- Weakens turf density
❌ Dull blades:
- Tears grass instead of cutting cleanly
- Grass tips turn brown (looks unhealthy even after fertilization).
- Increases disease risk
We can apply perfect treatments, but if you’re scalping your Bermuda to 0.5 inches or letting it grow 8 inches between mows, your lawn will struggle.
The Complete Picture: What Success Actually Requires
Let’s put it all together.
The Success Formula:
50% Complete Lawn Care’s Responsibility:
- ✅ Right products (professional-grade custom blends)
- ✅ Right timing (soil temp-based, not calendar)
- ✅ Right application (proper rates, even coverage)
- ✅ Fall pre-emergent (September/October)
- ✅ Early spring pre-emergent (January/February)
- ✅ Post-emergent as needed (breakthrough control)
- ✅ Seasonal fertilization (7 applications)
50% Homeowner’s Responsibility:
- ✅ Proper watering (1 inch/week, deep and infrequent)
- ✅ Proper mowing height (species-appropriate)
- ✅ Weekly mowing (consistent schedule)
- ✅ Sharp mower blades (every 10-20 mows)
- ✅ Patience (giving program time to work)
If either side drops the ball, results suffer.
What to Expect Based on When You Sign Up
Let’s set realistic expectations for different start dates.
Ideal Start Time: September/October (Fall Sign-Up)
Why this is best:
- We apply fall pre-emergent immediately.
- Prevents winter weeds (henbit, chickweed, Poa annua)
- Early spring pre-emergent follows in January/February
- Prevents crabgrass before it starts
- Result: You see great results by late spring (April/May).
Timeline: 6-8 months to great results
Good Start Time: January/February (Early Spring Sign-Up)
Why this is good:
- We apply early spring pre-emergent immediately.
- Prevents crabgrass (the big one)
- Winter weeds may already be present (but manageable with post-emergent).
- Fall pre-emergent follows in September
- Result: Good results by summer, great results by Year 2 spring
Timeline: 8-10 months to good results, 14-16 months to great results
Late Start Time: March/April (Mid-Spring Sign-Up)
Why this is challenging:
- Missed fall pre-emergent (winter weeds already established)
- Late for early spring pre-emergent (some crabgrass already germinating)
- Fighting weeds reactively for the rest of Year 1
- Won’t see prevention benefits until Year 2
- Result: The lawn looks better than before, but not great until Year 2.
Timeline: 12-18 months to great results
Very Late Start Time: May-August (Summer Sign-Up)
Why this is the hardest:
- Missed BOTH critical pre-emergent windows
- Full reactive mode all summer
- Fighting weeds in peak heat (harder to control)
- Must commit through fall and into Year 2
- Result: Modest improvement Year 1, good results Year 2
Timeline: 18-24 months to great results
The Realistic Conversation: What We Tell Mid-Season Sign-Ups
Here’s what we actually say to customers who call in March or later.
Our Honest Assessment:
“We’d love to have you as a customer, but here’s what you need to know:
What we CAN do this year:
- ✅ Make your lawn look significantly better than it does now
- ✅ Kill existing weeds with post-emergent treatments
- ✅ Thicken turf with fertilization
- ✅ Apply late pre-emergent (some protection, not complete)
- ✅ Reduce weed seed bank over time
What we CAN’T do this year:
- ❌ Prevent weeds that have already germinated (there’s no magic spray for this).
- ❌ Give you a weed-free lawn by June (you missed prevention windows)
- ❌ Make your lawn look like your neighbor’s, who’s been on a program for 3 years.
What you’ll experience this year:
- Lawn improvement (yes)
- Ongoing weed management (post-emergent applications)
- Service calls for breakthrough weeds (included, no extra charge)
- Frustration that weeds keep appearing (normal when starting mid-season)
Why you should still sign up:
- We need to get fall pre-emergent down (September/October).
- We need to get early spring pre-emergent down (January/February).
- Year 2 will be dramatically better.
- Starting now is still better than waiting another year.
But if you’re not willing to commit through Year 2, it might not be worth it.”
This is the conversation most lawn care companies won’t have with you. We’d rather be honest than take your money and let you be disappointed.
Real Customer Example: March Sign-Up Reality
Let’s look at what actually happened with a real customer.
Customer: David M., Tulsa
Sign-up date: March 15, 2023
Starting condition:
- Lawn thin and weedy
- Henbit everywhere (purple flowers taking over)
- Chickweed in shaded areas
- Previous owner did minimal maintenance
Year 1 Experience (March 2023 – February 2024):
March-April: Post-emergent kills henbit and chickweed; the lawn looks much better.
May-June: Crabgrass starts appearing (missed early prevention window).
July-August: Continued crabgrass pressure, multiple service calls, customer frustrated
September: Fall pre-emergent applied (finally ahead of the problem)
October-February: Lawn dormant, minimal weeds
Customer feedback after Year 1: “The lawn is better than it was, but I’m still fighting weeds.” Is this normal?”
Our response: “Yes—you started mid-season. Watch what happens in Year 2.”
Year 2 Experience (March 2024 – February 2025):
January: Early spring pre-emergent applied (on time this year!)
March-April: Minimal weeds (pre-emergent working!)
May-August: Occasional breakthrough weed (normal), but 90% fewer than Year 1
September: Fall pre-emergent applied (second year in a row)
Customer feedback after Year 2: “NOW this is what I expected! Why didn’t it look like this last year?”
Our response: “Because this year we were able to PREVENT weeds. Last year we were FIGHTING weeds. That’s the difference between pre-emergent timing and starting mid-season.”
David is now a 5-year customer. His lawn looks incredible. But he had to trust the process through Year 1.
The Bottom Line: Timing Matters, but Starting Late Is Better Than Not Starting
Here’s the reality:
✅ Best start time: Fall (September/October)
✅ Good start time: Early spring (January/February)
✅ Challenging start time: Mid-spring (March/April)
✅ Hardest start time: Summer (May-August)
But:
- Starting late is better than not starting at all.
- You need fall and early spring pre-emergent to see prevention.
- Post-emergent will make your lawn look better this year (but not great).
- Year 2 is when you’ll see the results you actually wanted.
And remember:
- Proper watering matters (1 inch/week, deep and infrequent)
- Proper mowing matters (weekly, correct height, sharp blades).
- We can’t overcome bad homeowner practices.
Lawn care is a partnership. We do our part, you do yours, and together we get great results.
Ready to Start (With Realistic Expectations Based on Timing)?
At Complete Lawn Care, we’ve been serving Tulsa for 25+ years. We won’t sugarcoat the timeline or promise instant results.
If you’re signing up mid-season:
- We’ll be honest about what to expect.
- We’ll make your lawn better this year.
- We’ll set you up for great results in Year 2.
- We’ll include service calls for breakthrough weeds (no extra charge).
If you’re signing up at the ideal time (fall or early spring):
- We’ll maximize prevention from day one.
- You’ll see results faster.
- Pre-emergent timing will be perfect
Either way, we’ll communicate honestly and work with you every step.
Try us risk-free: The first application is just $19.95 for lawns up to 10,000 sq ft.
📞 Contact Complete Lawn Care today to start your lawn care program—and have an honest conversation about timing, expectations, and what success looks like based on when you’re starting.
Proudly serving Tulsa, Broken Arrow, Jenks, Bixby, Owasso, Coweta, Sand Springs, Sapulpa, Skiatook, Collinsville, and surrounding communities
P.S. If you’re reading this in March or later and feeling discouraged—don’t be. Sign up now so we can get fall pre-emergent down. Year 2 will make it all worth it.