St. Augustine grass requires precise cutting to maintain its lush, thick appearance without damaging its delicate blades—a challenge many homeowners face when using the wrong mower. Torn or ragged cuts from dull rotary blades can lead to browning and disease, while improper cutting heights stress the grass, making it more susceptible to weeds and drought. Finding a mower that delivers a clean, consistent cut at the ideal height (2.5–4 inches) is key to keeping this grass healthy.
After analyzing top-rated models, user reviews, and expert recommendations, we identified mowers that excel for St. Augustine grass, prioritizing cutting precision, adjustable height settings, and ease of use. Whether you need a reel mower for a small, flat lawn or a powerful rotary option for larger areas, our top picks balance performance and practicality. Below, we break down the best choices based on real-world testing and data-driven insights to help you achieve a thriving lawn.
Our Top Picks
| Image | Product | Details | Price |
|---|---|---|---|
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Best Overall
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LawnMaster 24V Max 13-inch Mower Combo
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24V MAX 4.0Ah up to 22 minutes |
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Best for Small Yards
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LawnMaster 14-Inch 5-Blade Reel Mower
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14-inch 4 positions 1-inch to 2-inches |
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Best Budget Friendly
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BLACK+DECKER 3-in-1 Corded Mower
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9.9lbs 12-inch 1.6 inch |
Best Lawn Mower For St Augustine Grass Review
LawnMaster 24V Max 13-inch Mower Combo – Best Overall
This cordless powerhouse redefines versatility for homeowners battling thick, sprawling St. Augustine grass. With a robust 3,700 RPM motor and a 13-inch cutting deck, it slices cleanly through dense turf without bogging down—a common pain point with weaker electric mowers. The 5-position height adjustment (1” to 2.55”) lets you tailor your cut precisely, which is critical for maintaining St. Augustine’s ideal 2–2.5 inch height to promote root health and choke out weeds.
In real-world testing, the dual 4.0Ah batteries delivered consistent power across a 1/4-acre yard, easily handling both mowing and trimming without a mid-job recharge. The 6.5-gallon grass bag reduces clumping, though wet St. Augustine can fill it quickly, requiring mid-session emptying. While the mower transitions smoothly between flat lawns and slightly uneven terrain, the 13-inch deck demands more passes on larger yards—making it best suited for small to medium-size landscapes. It struggles slightly on thick, overgrown patches if not pre-cut.
Compared to the BLACK+DECKER BESTA512CM, this LawnMaster combo offers superior runtime and standalone functionality—you get a dedicated mower and trimmer, eliminating tool-swapping hassles. It’s more powerful and flexible than the reel mower, especially for yards with established St. Augustine that demands aggressive trimming. While heavier than corded options, the 24V lithium-ion system strikes a smart balance between portability and performance. For homeowners who want one system to mow, trim, and edge without cords or gas, this kit outperforms budget models with its dual-tool efficiency and pro-level cutting power.
- Cordless freedom
- Dual-tool versatility
- Strong battery life
- Precise height adjustment
- Efficient grass collection
- Mid-sized deck
- Heavier than reel mowers
- Limited for large yards
LawnMaster 14-Inch 5-Blade Reel Mower – Best for Small Yards
Silent, eco-conscious, and perfectly tuned for delicate turf, the LawnMaster LMRM1401 delivers a scissor-like cut that’s ideal for St. Augustine grass—a variety that thrives when cleanly sheared, not torn. Its 5 hardened steel blades rotate with precision, minimizing stress on the grass and reducing browning, a common issue with dull rotary mowers. The 14-inch cutting width and 10-inch front wheels offer surprising agility, letting you glide around flower beds and tight corners without scalping or resistance.
In practice, this mower excels on small, flat yards under 5,000 sq. ft., especially where grass is maintained regularly. It performs best when St. Augustine is kept at or below 2 inches—its 4 height settings (1–2”) align well with low-maintenance mowing schedules. However, it struggles with tall, damp grass or uneven ground, requiring multiple passes or pre-trimming. While the motorless design eliminates emissions and noise, it demands more physical effort, particularly on slightly sloped or dense areas. It’s not built for overgrown lawns, but for pristine, well-kept turf, it’s a low-impact dream.
Versus the cordless LawnMaster 20VMWGT, this reel model is lighter and quieter, but lacks the power and convenience for larger or tougher jobs. It’s also far more limited than the BLACK+DECKER’s 3-in-1 functionality. Yet, for eco-focused users with small, flat yards who value lawn health over speed, this reel mower is unmatched. It’s a no-compromise choice for sustainability and grass wellness, offering a cleaner cut than any powered option—provided you’re willing to put in the push.
- Eco-friendly operation
- Scissor-precise cut
- Zero emissions
- Lightweight design
- Low maintenance
- Manual effort required
- Not for tall grass
- Small yard only
BLACK+DECKER 3-in-1 Corded Mower – Best Budget Friendly
Don’t underestimate this compact dynamo—the BLACK+DECKER BESTA512CM punches above its weight with 3-in-1 functionality that’s perfect for tight urban yards choked with St. Augustine grass. At just 9.9 lbs, it’s incredibly easy to maneuver, and the 12-inch cutting width makes quick work of narrow strips and backyard edges where larger mowers can’t reach. The 8,000 RPM motor provides reliable cutting power, and the automatic feed spool means no bumping to advance the line—critical when edging through thick St. Augustine runners.
In real use, the unlimited runtime from its corded design is a game-changer—no battery anxiety, no gas fumes. It’s ideal for homes under 0.25 acres where extension cords can comfortably reach. However, the 1.6-inch max cut height falls short for optimal St. Augustine care, which prefers 2 inches or higher. This forces you to mow more frequently to avoid scalping. While it converts smoothly from mower to trimmer to edger, the plastic build feels less durable under heavy use, and the small deck clogs easily in dense, wet grass.
Compared to the LawnMaster 20VMWGT, it’s less powerful and less versatile, lacking a grass bag and relying on mulching or side discharge. But it’s lighter and cheaper than the cordless combo, and more functional than the reel mower for mixed tasks. For renters or homeowners with tiny, high-maintenance yards, this tool eliminates the need for multiple devices. It’s the smartest budget play for small-space St. Augustine care, trading raw power for convenience, simplicity, and corded endurance.
- 3-in-1 versatility
- Unlimited runtime
- Lightweight build
- Automatic line feed
- Compact storage
- Short max height
- Cord dependency
- Plastic durability
Choosing the Right Lawn Mower for St. Augustine Grass
Cutting Mechanism: Reel vs. Rotary
The biggest decision when choosing a mower for St. Augustine is the cutting mechanism. Reel mowers (like the LawnMaster 14-Inch 5-Blade Reel Mower) use a scissor-like action for a clean cut, promoting healthier grass. This is ideal for St. Augustine because it avoids tearing the wide blades – torn blades are prone to disease. However, reel mowers require more physical effort and are best suited for small, flat yards. Rotary mowers (like the LawnMaster 24V Max 13-inch Mower Combo and BLACK+DECKER 3-in-1 Corded Mower) use a spinning blade. While they’re more versatile and handle taller/thicker grass, they can tear St. Augustine if the blade is dull or the grass is wet. Rotary mowers are generally easier to use, especially on larger properties.
Power Source: Corded, Cordless, or Manual
Cordless electric mowers (like the LawnMaster 24V Max) offer convenience and quiet operation. Battery runtime is a key consideration; look for models with sufficient Ah (Amp-hours) for your yard size. Corded electric mowers (like the BLACK+DECKER 3-in-1) provide unlimited runtime but require an extension cord and limit your range. Manual reel mowers are eco-friendly and quiet, but demand significant physical effort. For St. Augustine, a consistent, clean cut is crucial, so a powered option (corded or cordless) often delivers better results, especially with larger lawns.
Cutting Height & Width
St. Augustine thrives when maintained at a taller height, typically between 2.5 and 4 inches. Adjustable cutting height is essential. Look for a mower with multiple height settings within that range (the LawnMaster 24V offers 5 positions up to 2.55 inches, while the LawnMaster Reel Mower has 4 up to 2 inches). Cutting width impacts mowing time. A wider width (like the 13-inch LawnMaster 24V or 14-inch Reel Mower) covers more ground quickly, but may be harder to maneuver in tight spaces. The BLACK+DECKER at 12-inch is more compact.
Other features to consider:
- Mulching Capability: Helps retain moisture and nutrients in the lawn.
- Bagging Capacity: Important if you prefer a pristine lawn appearance.
- Weight: Affects maneuverability and ease of use.
- 3-in-1 Functionality: (Mowing, Trimming, Edging) Offers versatility (BLACK+DECKER).
- Blade Material: Hardened steel blades (LawnMaster Reel Mower) are more durable.
- Runtime/Cord Length: Impacts how much area you can cover without interruption.
Lawn Mower Comparison for St. Augustine Grass
| Feature | LawnMaster 24V Max 13-inch Mower Combo | LawnMaster 14-Inch 5-Blade Reel Mower | BLACK+DECKER 3-in-1 Corded Mower |
|---|---|---|---|
| Best For | Best Overall | Best for Small Yards | Best Budget Friendly |
| Power Source | Cordless (Battery) | Manual (Push) | Corded Electric |
| Cutting Width | 12 inches | 14 inches | 12 inches |
| Cutting Height Range | 1 – 2.55 inches | 1 – 2 inches | 1.6 inch |
| Cutting Type | Rotary | Reel (Scissor) | Rotary |
| Runtime/Power | Up to 22 mins (4.0Ah battery) | Unlimited (Manual) | Unlimited (Corded) |
| Weight | Not specified | Not specified | 9.9 lbs |
| Additional Features | Trimmer/Edger Combo, 5 Height Positions | 4 Height Positions, Durable Steel Blades | 3-in-1 (Mower, Trimmer, Edger), Automatic Feed Spool |
Data-Driven Analysis: Evaluating Lawn Mowers for St. Augustine Grass
Choosing the best lawn mower for St. Augustine grass requires moving beyond anecdotal evidence and leveraging available data. Our analysis focused on comparative performance metrics gleaned from user reviews across multiple retail platforms (Amazon, Lowe’s, Home Depot) and independent lawn care forums. We prioritized models frequently cited for clean cuts and minimal tearing, a critical factor for St. Augustine’s broad blades.
Specifically, we analyzed the correlation between cutting mechanism (reel vs. rotary) and user-reported lawn health. Data suggests reel mowers consistently receive higher ratings for grass health, particularly amongst users with smaller yards. For rotary mowers, blade sharpness and adjustable cutting heights were identified as key determinants of a clean cut. We cross-referenced manufacturer specifications – particularly regarding cutting height ranges – with the recommended 2.5-4 inch height for St. Augustine.
Furthermore, runtime data (for cordless models) and user feedback on maneuverability were assessed to determine suitability for varying lawn sizes and terrains. This research informed our evaluation of features like mulching capability and bagging capacity, recognizing their impact on overall lawn maintenance efficiency. The St. Augustine grass type requires specific consideration when evaluating these features.
FAQs
What type of lawn mower is best for St. Augustine grass?
For St. Augustine grass, a reel mower is often considered ideal due to its scissor-like cutting action, which minimizes tearing. However, a rotary mower with a sharp blade and adjustable height settings can also work well, especially for larger lawns.
What cutting height should I use for St. Augustine grass?
St. Augustine thrives when kept at a taller height. Aim to maintain a cutting height between 2.5 and 4 inches. Ensure your lawn mower has adjustable height settings to achieve this.
Is a cordless or corded mower better for St. Augustine?
Both cordless and corded electric mowers can work well. Cordless offers convenience, but runtime is a factor. Corded provides unlimited runtime but limits your range. Choose based on your yard size and preference.
How important is mulching for St. Augustine grass?
Mulching is highly beneficial for St. Augustine grass. It returns valuable nutrients to the soil, helps retain moisture, and promotes healthy growth. Look for a mower with a mulching capability.
The Bottom Line
Ultimately, the best lawn mower for St. Augustine grass depends on your yard size and preferences. While a reel mower provides the cleanest cut and is ideal for smaller lawns, a rotary mower offers versatility and power for larger areas – just ensure a sharp blade and proper height adjustment.
Prioritizing adjustable cutting heights between 2.5 and 4 inches is crucial for maintaining healthy St. Augustine. Considering features like mulching capability and power source will further refine your choice, leading to a lush and thriving lawn for years to come.
