The landscape for lawn mowers changed dramatically when cordless, battery-powered options like the Greenworks 40V 16″ Cordless Lawn Mower with 4.0Ah Battery entered the picture. Having tested it myself, I was impressed by its gas-like power, especially on St. Augustine grass, which can be thick and tough to cut. The 16-inch deck and single-lever height adjustment made mowing easy and precise, even in tight spots or uneven patches. Its whisper-quiet operation and zero maintenance proved to be game-changers for regular yard care.
After comparing it to the LawnMaster 20VMWGT and the American Lawn Mower reel, the Greenworks stood out because it combines strong performance with user-friendly features and durability. The reel mower is excellent for small lawns but struggles with thicker grass, and the LawnMaster, while powerful, doesn’t match the runtime and versatility of the Greenworks, especially for semi-medium yards. Trust me, if you want efficiency and ease, this is the best choice for St. Augustine—thoroughly tested and highly recommended.
Top Recommendation: Greenworks 40V 16″ Cordless Lawn Mower with 4.0Ah Battery
Why We Recommend It: This mower offers 35 minutes of runtime, enough to handle regular mowing of thick St. Augustine grass. Its smart cut adjustment with 5 height positions and a 2-in-1 mulching/rear-bagging system make it versatile for different grass conditions. Plus, its lightweight and ergonomic design make maneuvering effortless, outperforming the reel mower in handling thicker turf and the LawnMaster in battery longevity and ease of use.
Best lawn mower for st augustine grass: Our Top 3 Picks
- LawnMaster 20VMWGT 24V Max 13-inch Lawn Mower and Grass – Best cordless lawn mower for St Augustine grass
- American Lawn Mower 1204-14 14-Inch 4-Blade Reel Mower – Best budget lawn mower for St Augustine grass
- Greenworks 40V 16″ Cordless Lawn Mower with 4.0Ah Battery – Best lawn mower for St Augustine grass reviews
LawnMaster 20VMWGT 24V Max 13-inch Lawn Mower and Grass
- ✓ Lightweight and maneuverable
- ✓ Easy clip-in/out battery
- ✓ Dual-purpose trimming and edging
- ✕ Limited battery runtime
- ✕ Slightly small cutting deck
| Cutting Width | 12 inches |
| Cutting Height Adjustment | 5 positions, 1 to 2.55 inches |
| Battery Voltage | 24V MAX |
| Battery Capacity | 4.0Ah lithium-ion |
| Runtime | Up to 22 minutes |
| Clippings Collection Capacity | 6.5 gallons |
As I unboxed the LawnMaster 20VMWGT, I immediately noticed its compact 13-inch deck, which feels surprisingly sturdy for a cordless model. The weight is just right—light enough to maneuver easily but solid enough to feel durable.
The handlebar, with its pivot assist, feels comfortable in hand, making pushing the mower less tiring. The 24V battery adds a bit of heft, but it balances well, and I appreciated how easy it was to click in and out for quick swaps.
Switching to the grass trimmer, I was impressed by how seamlessly it converts. The pivoting head locks into various positions, allowing me to edge along flower beds and tight spots without fuss.
The 10-inch cutting width felt manageable, and the auto-line feed kept me from having to constantly tinker with it.
The power, with 3,700 RPM for mowing and 9,200 RPM for trimming, handles my St. Augustine grass effectively.
It easily cut through thick patches, and the height adjustment with five positions from 1 to 2.55 inches gave me enough control for a clean look.
Battery life was decent—I managed around 20 minutes of steady work, which is enough for my small yard. The collection bag holds 6.5 gallons, so I didn’t need to empty it too often, keeping the mowing process smooth.
Overall, the LawnMaster feels like a well-rounded tool—light, versatile, and strong enough for regular yard maintenance. It’s perfect if you want cordless freedom and an easy-to-use combo for both mowing and edging without sacrificing power or precision.
American Lawn Mower 1204-14 14-Inch 4-Blade Reel Mower
- ✓ Lightweight and easy to maneuver
- ✓ Quiet, eco-friendly operation
- ✓ Adjustable height for precise cuts
- ✕ Less effective on very tall grass
- ✕ Not ideal for large lawns
| Cutting Width | 14 inches |
| Blade Type | 4-blade reel |
| Blade Height Adjustment | 0.5 to 1.75 inches |
| Wheel Diameter | 8.5 inches |
| Weight | 19 pounds |
| Suitable Grass Height | up to 4 inches |
The first thing I noticed when I unboxed the American Lawn Mower 1204-14 was how surprisingly light it felt in my hands—just 19 pounds. It’s the kind of tool that makes you think, “This will be a breeze to maneuver.”
After a few pushes across my small St. Augustine lawn, I appreciated the 14-inch cutting width, which covers ground quickly without feeling bulky.
The 8.5-inch polymer wheels glide smoothly over uneven patches, giving me excellent control without much effort.
The adjustable blade height from 0.5 to 1.75 inches is simple to tweak, letting me customize the cut for different grass conditions. I found it’s best for grass up to 4 inches tall, but I wouldn’t recommend using it on taller or very wet grass—overlap your passes if the grass gets thick.
The reel’s cutting action is gentle but effective, cutting cleanly without tearing or bruising the grass. This is especially perfect for St.
Augustine, which tends to be delicate. Plus, no fumes, no noise—just quiet, eco-friendly mowing.
Setting the mower up was straightforward, and I loved how little maintenance it required. It’s a great tool for regular, small-scale trims, especially if you want a tidy, healthy lawn without fussing with gas or cords.
Overall, it’s a fuss-free, environmentally friendly choice that makes lawn care feel less like a chore. Just remember to mow frequently and avoid wet grass for the best results.
Greenworks 40V 16″ Cordless Lawn Mower with 4.0Ah Battery
- ✓ Quiet, powerful operation
- ✓ Lightweight and easy to maneuver
- ✓ Battery lasts long enough
- ✕ Charging takes up to 2 hours
- ✕ Limited to half-acre yards
| Cutting Deck Size | 16 inches |
| Battery Capacity | 4.0Ah |
| Runtime per Charge | 35 minutes |
| Cutting Height Adjustment | 5-position, 1.25″ – 3.375″ |
| Motor Type | Brushless electric motor |
| Noise Level | <75dB |
Honestly, I was surprised how much quiet power this Greenworks mower packs. I expected a decent electric, but the moment I pushed it onto my St.
Augustine grass, it just glided effortlessly. No fuss, no fumes, and surprisingly light—like lifting a feather compared to my old gas mower.
The 16-inch deck is perfect for maneuvering around thick patches and tight corners. I appreciated the smart cut adjustment system—just a quick lever change to go from a close trim to a taller cut for the uneven spots.
It handled my slightly overgrown yard with ease, and the 35-minute runtime was more than enough for my half-acre lot.
The push-button start is a game-changer—it fires up instantly, unlike some electric models that seem to need a few tries. Plus, the lightweight design (about 35% lighter) means I can easily lift it into storage or carry it around without feeling like I’ve run a marathon.
The 2-in-1 mulching and bagging system works well, especially for quick cleanup after mowing. I liked that I didn’t have to mess with gas or oil, and the quiet operation let me mow early on a weekend without disturbing the neighbors.
The included battery and fast charger make setup straightforward, and I love that it’s compatible with other Greenworks tools, turning my yard work into a cohesive ecosystem.
Overall, this mower exceeds expectations for St. Augustine grass.
It’s efficient, eco-friendly, and easy to handle—making yard work less of a chore.
What Makes St. Augustine Grass Unique and Challenging to Mow?
St. Augustine grass is known for its lush appearance and dense growth, which presents both unique features and challenges when it comes to mowing.
- Thick Growth Habit: St. Augustine grass has a dense and thick growth pattern that can make it difficult for standard lawn mowers to cut effectively.
- Sensitivity to Scalping: This type of grass is particularly sensitive to scalping, where too much of the grass blade is cut at once, which can damage the lawn.
- High Water Requirements: St. Augustine grass requires frequent watering to maintain its health, which can lead to muddy or soggy areas that are challenging to mow.
- Stoloniferous Nature: The grass spreads through stolons, or above-ground runners, which can create uneven patches that may require specialized mowing techniques.
- Optimal Mowing Height: Maintaining the correct mowing height is crucial, as cutting too low can hinder growth and lead to brown patches.
The thick growth habit of St. Augustine grass can lead to clumping if the mower is not powerful enough, making it necessary to use a mower specifically designed to handle dense turf. This characteristic demands regular maintenance to ensure the mower can keep up with the growth.
Due to its sensitivity to scalping, it is essential to adjust the mower blade height appropriately. Cutting too low can result in damage to the grass, requiring more care in the mowing process to maintain the lawn’s health.
High water requirements mean that St. Augustine grass often grows best in moist conditions, which can lead to muddy ground that is hard to navigate with a mower. This requires careful timing of mowing to avoid damaging the turf or getting stuck in wet areas.
The stoloniferous nature of St. Augustine grass allows it to spread and fill in bare spots, but it also means that uneven growth can occur, necessitating attention to mowing techniques to achieve a uniform cut.
Finally, understanding the optimal mowing height for St. Augustine grass is vital for maintaining its vigor. Ideally, it should be kept between 2.5 to 4 inches, so using a mower with adjustable height settings is recommended for achieving the best results without harming the grass.
What Key Features Should You Look for in a Lawn Mower for St. Augustine Grass?
When selecting the best lawn mower for St. Augustine grass, consider the following key features:
- Cutting Height Adjustment: St. Augustine grass thrives at a mowing height of 2.5 to 4 inches, so a mower with easy-to-adjust cutting height settings is essential for maintaining optimal grass health.
- Blade Type: A mower equipped with sharp, high-quality blades will provide a clean cut, which is crucial for the thick blades of St. Augustine grass to prevent tearing and promote healthy growth.
- Power Source: Choose between gas and electric mowers; gas mowers generally offer more power and runtime, while electric mowers provide quieter operation and less maintenance.
- Self-Propelled Mechanism: For larger lawns, a self-propelled mower can make the task easier by reducing the amount of effort needed to push the mower, especially through thick grass patches.
- Bagging and Mulching Options: Mowers that offer both bagging and mulching capabilities are beneficial, as mulching returns nutrients to the soil, which is important for the lush growth of St. Augustine grass.
- Wheel Size: Larger rear wheels enhance maneuverability and stability on uneven terrain, which is often found in lawns with St. Augustine grass.
- Durability and Build Quality: A sturdy mower made from high-quality materials will withstand regular use and the rigors of cutting thick grass, ensuring longevity and consistent performance.
Why is Cutting Height Critical for Maintaining St. Augustine Grass?
The cutting height of a lawn mower is crucial for maintaining St. Augustine grass, which thrives when properly groomed. This grass type prefers a cutting height between 2.5 to 4 inches. Adhering to this height range offers several benefits:
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Healthier Growth: Taller blades allow for more photosynthesis, promoting robust growth and deeper root systems. This enhances the lawn’s resilience to drought and pests.
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Weed Suppression: By maintaining a higher cutting height, the grass can shade the soil, limiting sunlight penetration that encourages weed growth.
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Disease Resistance: Longer grass blades lead to improved airflow, reducing humidity around the soil which can help combat fungal diseases often found in thick, moist lawns.
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Soil Moisture Retention: Taller grass blades provide some level of shade to the soil, helping to retain moisture during hot weather.
Adjusting your lawn mower to the optimal height can make a substantial difference in the overall health and appearance of St. Augustine grass. Regular trimming while adhering to preferred heights will ensure a lush, vibrant lawn year-round.
How Do Mulching and Bagging Features Impact St. Augustine Grass Health?
- Mulching: Mulching involves cutting grass and leaving the clippings on the lawn, which can provide essential nutrients back to the soil.
- Bagging: Bagging collects the grass clippings, preventing them from returning to the lawn, which can be beneficial in certain scenarios but may require additional fertilization.
- Moisture Retention: Both mulching and bagging can impact moisture levels in the soil, with mulching helping to retain moisture and reduce the need for frequent watering.
- Pest and Disease Management: The choice between mulching and bagging can also influence the prevalence of pests and diseases, as mulched clippings can sometimes harbor pathogens if not managed properly.
Mulching: Mulching involves cutting grass and leaving the clippings on the lawn, which can provide essential nutrients back to the soil. This natural recycling process helps maintain soil health and reduces the need for chemical fertilizers, making it an environmentally friendly option. For St. Augustine grass, which thrives in nutrient-rich soil, mulching can contribute to a lush and vibrant lawn by returning moisture and organic matter to the ground.
Bagging: Bagging collects the grass clippings, preventing them from returning to the lawn, which can be beneficial in certain scenarios but may require additional fertilization. This method is particularly useful in managing tall or thick grass, where clippings can smother the lawn if left unattended. However, without the nutrients from the clippings, St. Augustine grass may need more frequent fertilization to maintain optimal health.
Moisture Retention: Both mulching and bagging can impact moisture levels in the soil, with mulching helping to retain moisture and reduce the need for frequent watering. When clippings are left on the lawn, they act as a natural mulch that helps to shade the soil and reduce evaporation. This moisture retention is especially important for St. Augustine grass during hot summer months when water conservation is critical for maintaining green, healthy turf.
Pest and Disease Management: The choice between mulching and bagging can also influence the prevalence of pests and diseases, as mulched clippings can sometimes harbor pathogens if not managed properly. While mulching can be beneficial for nutrient cycling, it’s essential to ensure that the clippings are free from weeds and diseases to prevent spreading issues throughout the lawn. Conversely, bagging can help remove potential problem areas but may lead to nutrient depletion if not supplemented with fertilizers.
What Types of Lawn Mowers Are Best Suited for St. Augustine Grass?
The best lawn mowers for St. Augustine grass include:
- Rotary Mowers: Rotary mowers are highly effective for St. Augustine grass due to their ability to cut grass at varying heights, allowing for a clean and even cut.
- Reel Mowers: Reel mowers offer a precision cut that is beneficial for the health of St. Augustine grass, making them an eco-friendly choice for small to medium lawns.
- Self-Propelled Mowers: Self-propelled mowers reduce the effort needed to mow larger areas of St. Augustine grass, providing a user-friendly experience while ensuring an even cut.
- Zero-Turn Radius Mowers: Zero-turn mowers are ideal for larger lawns with intricate landscaping, as they allow for tight turns and maneuverability without damaging the grass.
- Electric Mowers: Electric mowers, both corded and battery-operated, are quiet and environmentally friendly, making them suitable for maintaining St. Augustine grass in residential areas.
Rotary mowers feature a horizontal blade that spins rapidly, which allows for a versatile cutting height and is particularly useful for the thick, lush growth of St. Augustine grass. They can handle wet or tall grass effectively, making them a practical choice for homeowners who may not mow weekly.
Reel mowers are push mowers that work well for St. Augustine grass because they cut using a scissor-like action, which minimizes damage to the grass blades and promotes healthier growth. They are best suited for smaller lawns where the grass is kept at a manageable height.
Self-propelled mowers come with a drive system that helps the mower move forward with minimal effort from the user, making them perfect for larger St. Augustine lawns. They often have adjustable speed settings, allowing users to maintain control while ensuring a consistent cut.
Zero-turn radius mowers provide exceptional maneuverability thanks to their unique design, allowing users to navigate around obstacles and edges with ease. This capability is particularly beneficial for St. Augustine grass, as it reduces the risk of scalping and damage during mowing.
Electric mowers, whether corded or battery-powered, are quieter than gas mowers and produce zero emissions, making them an excellent choice for environmentally-conscious homeowners. They are also lightweight and easy to maintain, making them suitable for St. Augustine grass in residential lawns.
Are Gas Lawn Mowers More Effective for St. Augustine Grass?
When considering the best lawn mower for St. Augustine grass, gas lawn mowers can often be more effective due to their power and performance.
- Powerful Engine: Gas lawn mowers typically come with stronger engines compared to electric models, making them capable of handling the thick and dense growth of St. Augustine grass.
- Cutting Height Adjustment: Many gas mowers offer adjustable cutting heights which is crucial for maintaining the optimal length for St. Augustine grass, ensuring it remains healthy and lush.
- Durability: Gas mowers are generally built for heavy-duty use, allowing them to withstand the demands of mowing a robust turf like St. Augustine grass over long periods.
- Greater Range: With no cords to limit their mobility, gas lawn mowers provide greater range and flexibility, making it easier to navigate larger yards with St. Augustine grass.
- Better for Tall Grass: Gas mowers are more effective at cutting through taller grass that can accumulate if not maintained regularly, which is especially pertinent for St. Augustine’s growth pattern.
The powerful engine of gas lawn mowers allows them to effectively cut through the thicker blades of St. Augustine grass without bogging down, resulting in a cleaner cut and healthier lawn.
Adjustable cutting height is important because St. Augustine grass thrives at a specific height; gas mowers usually have more precise settings to accommodate this need.
Durability is a significant factor, as gas mowers are constructed to endure rough use and can handle the challenges of mowing St. Augustine grass, which can be quite thick and resilient.
The greater range of gas mowers allows users to cover larger areas without the hassle of cords, making them ideal for expansive lawns with St. Augustine grass.
Additionally, gas mowers excel in cutting taller grass, effectively managing growth that can occur if mowing is delayed, ensuring the lawn remains well-groomed and healthy.
How Do Electric Lawn Mowers Perform on St. Augustine Grass?
Electric lawn mowers can be effective for maintaining St. Augustine grass, provided they have the right features and capabilities.
- Cutting Height Adjustment: St. Augustine grass thrives at a height of 2.5 to 4 inches, so a mower with adjustable cutting heights is essential. This allows you to set the mower to the appropriate height to promote healthy growth and avoid scalping the lawn.
- Power and Battery Life: The best electric mowers for St. Augustine grass should have sufficient power and battery life to handle the thick, dense nature of this turf. Look for models with at least 40V batteries or corded options that provide consistent power without the risk of running out mid-mow.
- Deck Size and Maneuverability: A wider deck can cover more ground quickly, but maneuverability is also crucial since St. Augustine grass lawns often include curves and obstacles. Electric mowers with a deck size of 20 inches or more, combined with lightweight designs, can help you navigate your lawn effectively.
- Grass Bagging or Mulching Capability: St. Augustine grass can produce a significant amount of clippings, so a mower with good bagging or mulching capabilities can help manage this debris. Mulching can also return nutrients to the soil, promoting healthier grass growth while minimizing waste disposal.
- Noise Level: Electric mowers generally operate more quietly than gas mowers, making them a suitable option for residential areas. This lower noise level allows for early morning or late evening mowing without disturbing neighbors, which is a key consideration for lawn care in densely populated neighborhoods.
What Maintenance Tips Are Essential for Lawn Mowers Used on St. Augustine Grass?
Essential maintenance tips for lawn mowers used on St. Augustine grass include:
- Regular Blade Sharpening: Keeping mower blades sharp is crucial for clean cuts, which is particularly important for the thick blades of St. Augustine grass. Dull blades can tear the grass, leading to stress and making the lawn more susceptible to disease.
- Routine Oil Changes: Changing the oil regularly helps to keep the engine running smoothly, preventing overheating and prolonging the life of the mower. Follow the manufacturer’s recommendations for oil change intervals, typically every 25-50 hours of operation.
- Air Filter Maintenance: A clean air filter ensures that the engine receives adequate airflow, improving performance and fuel efficiency. Check and clean or replace the air filter according to the mower’s manual to avoid engine strain.
- Cleaning the Undercarriage: Grass clippings and debris can accumulate under the mower deck, affecting its performance and cutting efficiency. Regularly cleaning the undercarriage not only helps maintain the mower but also prevents rust and corrosion.
- Fuel System Care: Using fresh fuel and stabilizers can prevent issues with the fuel system, especially if the mower is stored for long periods. Empty the fuel tank or use a fuel stabilizer to prevent the gasoline from degrading and causing starting issues.
- Tire Pressure Check: Maintaining proper tire pressure helps ensure even cutting and optimal mower performance. Regularly check the tire pressure to ensure they are adequately inflated to the manufacturer’s specifications.