Greenworks 80V 21" Brushless Cordless (Self-Propelled) Lawn Mower (75+ Compatible Tools), 4.0Ah Battery and 60 Minute Rapid Charger Included Review

Quick Verdict

The Greenworks 80V wins for versatility and value, offering powerful manual control and a massive tool ecosystem for nearly $300 less, while the Gardena robot is best only if you prioritize total hands-off mowing on a very small lawn.

Side-by-Side Comparison

Where Greenworks Wins

1. Massive Power and Cutting Performance – The 80V brushless motor delivers torque comparable to gas mowers, with a full 21-inch steel deck cutting width. It handles thick, wet, or tall grass easily, whereas the Gardena’s small 7.5-inch blade must cut very frequently (often daily) and struggles with overgrowth or uneven terrain.

2. Superior Value and Tool Ecosystem – At $559.99, you get a self-propelled mower, a 4.0Ah battery, and a rapid charger. Plus, it’s part of Greenworks’ 80V family (75+ compatible tools like trimmers, blowers, chainsaws). The Gardena costs 50% more and works only as a standalone robot with no shared battery system.

3. Full Control for Complex Yards – With variable-speed self-propulsion and a manual handle, you can maneuver around flower beds, steep slopes, narrow paths, and obstacles instantly. The Gardena requires boundary wire installation, can’t handle slopes over 25%, and may get stuck on roots, gravel, or tight corners.

Where Gardena Wins

1. True Hands-Off Automation – The SILENO Minimo mows completely on its own—program via Bluetooth app, set a schedule, and it returns to its charging station automatically. You never touch a handle, listen to engine noise, or store it away. Perfect for those who hate mowing.

2. Ultra-Quiet Operation – At just 58 decibels (one of the quietest in its class), it’s barely louder than a conversation. You can mow early morning or late evening without disturbing neighbors. The Greenworks is much louder (around 80-85 dB under load).

3. Perfect for Small, Simple Lawns – Designed for lawns up to 5,400 sq ft, it excels on flat, open, obstacle-free yards. It mulches clippings so fine they disappear, eliminating bagging or raking. No fuel, no oil, no cord—just set and forget for weeks at a time.

Which Should You Buy?

Buy Mower A (Greenworks 80V) if:

• You have a medium to large yard (over 5,400 sq ft) with slopes, trees, flower beds, or irregular shapes.
• You want the power to tackle tall or thick grass on your schedule, not the robot’s.
• You value saving $288 and want a mower that shares batteries with leaf blowers, trimmers, and chainsaws.

Buy Mower B (Gardena SILENO Minimo) if:

• Your lawn is small (under 5,400 sq ft), flat, and mostly open with no complex obstacles.
• You absolutely despise mowing and want a set-and-forget solution that runs silently while you relax.
• You’re willing to install boundary wire and accept that the robot can’t handle overgrowth, steep hills, or wet grass—and you’ll still need a trimmer for edges.

Buy neither if:

• Your yard is between 0.2 and 0.5 acres with moderate obstacles—consider a mid-range robot like the Worx Landroid or a cheaper push mower instead.

Quick Verdict

The Greenworks 80V wins for most buyers due to its superior power, self-propelled convenience, and much higher customer satisfaction, while the Gardena robot is only a better fit for those who prioritize total hands-off mowing on very small, simple lawns.

Side-by-Side Comparison

Where Greenworks Wins

1. Power and Cutting Performance
The Greenworks uses an 80V brushless motor driving a 21-inch steel deck. This delivers gas-like torque for thick, wet, or tall grass, and the wide cutting deck means fewer passes. The Gardena’s tiny 7-inch cutting width is designed for light, frequent trims—it struggles with tall grass and cannot handle thick growth without multiple passes over several days.

2. Speed and Flexibility
With self-propelled drive and a 60-minute rapid charger, the Greenworks can mow a 10,000 sq ft lawn in about 45 minutes. You control when and where you mow—no boundary wires, no schedule programming. The Gardena robot takes hours per session (it moves slowly) and only works on lawns under 2,700 sq ft. For anything larger, you’d need multiple runs over multiple days.

3. Customer Satisfaction and Reliability
The Greenworks earns a 4.4/5 rating from 1,696 reviews—indicating consistent performance and durability. The Gardena scores only 3.6/5 from 2,728 reviews, with common complaints about boundary wire installation issues, software bugs, and poor handling of slopes or obstacles.

Where Gardena Wins

1. Zero Effort Required
The Gardena is fully autonomous. Once you install the boundary wire and set a schedule, it mows daily without any manual work. You never push, steer, or recharge a battery yourself. For someone with mobility issues or a very busy schedule, this is a genuine convenience.

2. Ideal for Tiny Lawns
At 2,700 sq ft max, the Gardena is purpose-built for postage-stamp yards. If your lawn is under 2,000 sq ft, the robot will keep it neatly trimmed with minimal intervention. The Greenworks is overkill (and heavy) for such small spaces.

3. Quiet Operation and Mulching
The Gardena runs at a whisper-quiet 58 dB—you can mow at 6 AM without disturbing neighbors. It also mulches grass into fine clippings that decompose quickly, eliminating bagging. The Greenworks is louder (though still quieter than gas) and requires you to manage clippings (bag, mulch, or side-discharge).

Which Should You Buy?

Buy Mower A (Greenworks 80V) if:

• Your lawn is larger than 2,700 sq ft (most suburban lots)
• You want a powerful, fast, and reliable mower that you control
• You prefer a one-time purchase with no boundary wire installation or app setup

Buy Mower B (Gardena SILENO Minimo) if:

• Your lawn is under 2,700 sq ft and very simple (no steep slopes, few obstacles)
• You cannot or do not want to push a mower at all
• You value complete autonomy over cutting speed and power

Neither is ideal if:

• Your lawn is between 3,000 and 5,000 sq ft: the Greenworks is overkill, but the Gardena won’t cover it. Consider a mid-sized cordless mower like the EGO 56V 20-inch ($499) or step up to a larger robot like the Husqvarna Automower 115H ($1,100).