After weeks of rain or a long vacation, your lawn may grow tall and uneven. Many homeowners ask: can a robot lawn mower cut long grass? The short answer is yes — but success depends on how you prepare and operate the mower.
Why long grass is a challenge
Tall or dense grass places extra load on blades and motors. Even push mowers can struggle to remove substantial length in a single pass. Robot mowers are designed primarily for maintenance mowing — frequent, light trims that keep a lawn healthy and even. For very tall grass, a staged approach works best.
How FJDynamics robot mowers handle taller lawns
FJDynamics products combine mechanical power with advanced navigation. Key capabilities that help with taller grass include:
- Adjustable cutting height — e.g., FL3000 standard 20–60 mm and up to 80 mm for the high-cut version; FR4000 operates 10–50 mm.
- High-torque brushless motors — consistent blade power for denser patches.
- RTK and vision navigation — precise coverage, obstacle recognition, and reduced missed areas.
- Smart path planning — automatic speed and route adjustments for slope and grass density.
- All-terrain capability — models like the FL3000 can handle slopes up to 33° (65%) and uneven surfaces.
Preparing your lawn for a robot mower
If the grass is over 15 cm (6 inches), perform an initial manual cut (or use a conventional lawn mower) to reduce height. This prevents blade clogging and ensures smoother first automated passes.
Recommended staged workflow:
- Start with the highest cutting height setting.
- Run the robot daily or every other day.
- Lower the cutting height gradually by a few millimeters per session.
- Maintain consistent mowing once desired height is reached.
Benefits of regular robotic mowing
- Greener, denser turf from frequent trimming and mulching.
- Fewer weeds due to constant cutting.
- Healthier soil from returned clippings acting as mulch.
- Quieter operation and significant time savings.
Choosing the right model for overgrown or uneven lawns
If your property frequently gets overgrown, prioritize models with a wide cutting height range (up to 80 mm), RTK + Vision navigation, powerful brushless motors, and weatherproof construction (IPX5 or better).
For example, the FL3000 Lidar Robot Mower combines RTK navigation, LiDAR vision, and intelligent mapping to deliver precise mowing even on slopes or thick grass.
Conclusion
Can robot lawn mowers cut long grass? Yes—when used strategically. Start high, mow gradually, and let the robot maintain the lawn thereafter. With FJDynamics’ RTK and Vision-enabled mowers, you can convert a neglected yard into a well-kept, hands-free landscape.
