St. Augustine Lawn Care Program – Southlake, TX

Designed by Aaron Shehan, Practical Agronomist  &
Author of The North Texas Lawn Playbook—
Built for Shade, Disease Pressure & High-pH Soils


9 Applications Per Year | Built Specifically for Southlake’s High-pH Clay Soils & High Disease Pressure


St. Augustine is one of the best-looking grasses in Southlake—but it is also one of the easiest to damage when treated incorrectly.


Most St. Augustine lawn problems here come down to shade, high-pH clay soil, moisture, disease pressure, and programs that treat St. Augustine like Bermuda.


Gro Lawn does not do that.



Our 9-round St. Augustine program is built around soil data, seasonal timing, disease pressure, shade, moisture, and turf condition—not a rigid calendar or one-size-fits-all treatment plan.

St. Augustine Thrives Here—If It’s Managed Correctly

St. Augustine can perform beautifully in Southlake when it is managed correctly.


It declines quickly when it is overfed, mistimed, watered incorrectly, or treated like Bermuda with a one-size-fits-all program.


Gro Lawn’s St. Augustine program is built around soil-temperature timing, controlled nutrition, shade and moisture awareness, and built-in disease protection—not calendar-based guesswork.



The goal is to protect the lawn first, support steady recovery, and avoid pushing growth when conditions make disease more likely.

Lawn Care in Southlake Isn’t One-Size-Fits-All

Every St. Augustine lawn in Southlake is dealing with a challenging combination of high-pH clay soil, shade, moisture, heat, and seasonal disease pressure.


That is why generic lawn programs often fail St. Augustine even faster than they fail Bermuda.


St. Augustine needs a different strategy: conservative nutrition, disease-aware timing, proper mowing, moisture management, and decisions based on the condition of the lawn—not a one-size-fits-all schedule.



This program is built specifically for how St. Augustine behaves in North Texas, so your lawn is protected, stabilized, and supported throughout the season.

Things to Know About St. Augustine in Southlake

  • December through March is typically dormancy, so no growth should be pushed.
  • St. Augustine responds to soil temperature, moisture, shade, and disease pressure—not calendar dates alone.
  • Southlake’s high-pH clay soils can restrict nutrient availability.
  • Excess nitrogen can increase disease risk and accelerate decline.
  • Disease pressure follows predictable seasonal patterns, especially in shaded or moisture-prone areas.

This program is designed to protect and stabilize St. Augustine first, then support steady growth when conditions are right.

What to Do Before Your Lawn Wakes Up in Spring

Early spring success does not come from pushing fertilizer too soon.


It comes from proper preparation before St. Augustine becomes fully active.


Before the growing season begins, St. Augustine lawns should be cleaned up, opened up, and evaluated for debris, matted stolons, trapped moisture, shade issues, and early disease pressure.


Proper spring preparation helps improve airflow, reduce moisture problems, warm the soil more evenly, and set the lawn up for a stronger, more stable growing season.

This is the same preparation approach we use to reduce early-season disease pressure and set St. Augustine lawns up for a stronger, more stable growing season.

How Our 9-Round St. Augustine Program Works

Gro Lawn’s 9-round St. Augustine program is built around protection first.


Each application is timed around the way St. Augustine actually behaves in Southlake: soil temperature, shade, moisture, disease pressure, seasonal weed pressure, and turf condition.


Some rounds focus on weed prevention. Some focus on disease suppression. Some include conservative nutrition only when the lawn can use it safely.


We do not treat St. Augustine like Bermuda, and we do not force the same products at every visit.

  • Round 1 – Winter Weed Prevention + Early Disease Protection

    This dormant-season application focuses on weed prevention and early disease protection—not growth.


    Specticle® pre-emergent helps prevent winter weeds before they emerge, while sulfate of potash supports stress tolerance. Propiconazole may be included when conditions are favorable for disease pressure.


    No nitrogen is applied during this stage because St. Augustine is not actively growing.

  • Round 2 - Extended Pre-Emergent + Disease Suppression

    This round continues pre-emergent weed protection while monitoring early-season disease pressure.


    Specticle® extends weed prevention, while propiconazole, sulfate of potash, and soil-temperature-based nutrition help protect the lawn as conditions begin to change.


    Ammonium sulfate and the Southlake MicroPak™ are introduced only when soil temperatures are warm enough for St. Augustine to use them safely.


    The goal is to support recovery without forcing growth too early.

  • Round 3 – Custom Decision Round — Nutrition or Disease Control

    Round 3 is not automatic fertilizer.


    At this stage, we evaluate the lawn based on current disease pressure, shade, moisture, weather, and turf condition.


    When disease pressure is low, we may use a nutrition-forward application with a 12-3-6 St. Augustine blend, humic acid, and Southlake MicroPak™.


    When disease risk is elevated, we shift to a disease-first approach using liquid fungicide protection, light ammonium sulfate, sulfate of potash, and Southlake MicroPak™.


    We do not force fertilizer when disease pressure is high. Protection comes

  • Round 4 – Second Custom Decision Round — Re-Evaluated

    A granular application of our proprietary 12-3-6 St. Augustine blend with North Texas MicroPak and humic acid.


    Supports steady growth without overstimulation while improving nutrient availability in high-pH soils.

  • Round 5 – Summer Stress Protection

    Another application of our 12-3-6 blend with North Texas MicroPak and humic acid to carry the lawn through peak summer.


    Improves heat tolerance, maintains color, and helps the lawn handle irrigation and shade stress more efficiently.



  • Round 6 – Late-Summer Stability

    A continued granular application of our 12-3-6 blend with North Texas MicroPak and humic acid.


    Restores density, strengthens roots, and improves nutrient uptake as the lawn transitions out of summer stress.

  • Round 7 – Fall Weed Control + Major Disease Prevention

    A liquid Specticle® pre-emergent plus Avenue South for broadleaf weeds, combined with AMS, SOP, and micronutrients, along with:


    • Propiconazole (preventative disease control)

    Targets fall weeds while preventing disease as conditions begin to favor fungus development.



  • Round 8 & 9 –Winter Disease Suppression + Soil Support

    A dedicated disease control round—something most companies skip.


    We apply a preventative fungicide targeting:


    • Brown Patch
    • Take-All Root Rot

    Timed specifically for fall disease pressure when St. Augustine is most vulnerable.



  • Round 9 – Elemental Sulfur for Long-Term Soil Health

    A granular elemental sulfur application to address high-pH soils common in Colleyville.


    Benefits:


    • Improves iron and phosphorus uptake
    • Enhances micronutrient availability
    • Increases effectiveness of every future treatment


View the actual fertilizer blend used in this program

Special Spring Program for New Customers

Starting in spring? We do it right from day one.


Your first application includes both:

  • Pre-emergent weed control
  • Post-emergent weed control


We target:

  • Broadleaf weeds
  • Annual bluegrass
  • Rescue grass


Spring-start customers are not overloaded with rushed applications just to catch up to a preset schedule.



Instead, treatments are spaced properly to protect the lawn, maintain product effectiveness, and avoid pushing St. Augustine too hard too early.

Why St. Augustine Lawns in Southlake Perform Better with Gro Lawn

Most lawn programs focus on visits. We focus on protection, timing, and results.

  • Conservative nitrogen strategy to reduce disease risk
  • Soil-driven care—not a one-size-fits-all program
  • Condition-based applications adjusted to the lawn
  • Built-in disease control, not treated as an afterthought
  • Potassium and micronutrients for stress tolerance and recovery
  • Elemental sulfur for long-term soil correction
  • Designed by Aaron Shehan with 30+ years of North Texas experience


BUILT FOR NORTH

TEXAS SOIL

Designed specifically for Colleyville’s high-pH clay soils—not generic national conditions.

Timed to Your Lawn—not the Calendar

Applications are based on soil temperature and growth stage, so your lawn gets what it needs at the right time.

Balanced Nutrition Year-Round

We don’t just fertilize in peak season. Your lawn is supported throughout the entire year.

Micronutrients Most

Companies Skip

Iron, manganese, and other key nutrients are included to support color, strength, and overall turf health.

Focused on Long-Term

Results

We improve soil health and nutrient availability so your lawn performs better year after year.

What No One Else Tells You About St. Augustine Lawns

Some St. Augustine problems cannot be fixed with treatments alone.


These include:

  • Too much shade
  • Poor drainage or overwatering
  • Chronic disease pressure
  • Compacted soil
  • High-pH clay soil conditions



In these situations, correction may be needed—not just another lawn application.

We believe in being upfront so you know exactly what to expect—and can make the right decision for your lawn.