Can a Robot Mower Handle Weeds? Honest Answer + Best Mowers

MA MowAutonomous Editorial Team · Updated 2026-06-23 · 8 min read

Weeds are thicker and tougher than grass. Can a robot mower handle them? The honest answer: yes for light weeds, no for heavy weeds. This guide explains what robot mowers can and can't do with weeds.

The Honest Answer

Robot mowers can handle light weeds (under 6 inches tall, similar thickness to grass). They cannot handle heavy weeds (over 6 inches, woody stems, dense patches). If your lawn is more weeds than grass, you need to address the weed problem first — a robot mower won't solve it.

Light Weeds: Robot Mowers Handle Them

If your lawn has occasional weeds mixed with grass (dandelions, clover, plantain), a robot mower will cut them along with the grass. The mower's blades are sharp enough to cut weed stems up to about 1/4 inch thick. You may need to replace blades more often (weeds dull blades faster than grass).

Heavy Weeds: Address the Problem First

If your lawn has dense weed patches, tall weeds (over 6 inches), or woody weeds (thistles, brush), a robot mower will struggle. The mower will: (1) Get stuck on tall weeds. (2) Tear rather than cut woody stems. (3) Miss weeds that are lower than the cutting height. Address the weed problem first: mow the weeds down with a push mower or string trimmer, then apply weed killer, then let the robot mower maintain.

Best Robot Mowers for Weedy Lawns

If your lawn has light-to-moderate weeds, the best robot mowers are those with powerful motors and wide cutting decks: (1) Mammotion LUBA 2 AWD 5000 ($2,899) — 600 Wh battery, 15.7-inch deck, handles thick growth. (2) Segway Navimow X450 ($3,499) — 360 Wh battery, 16-inch deck, ORV suspension. (3) Mammotion LUBA 2 AWD 3000X ($2,499) — 480 Wh battery, 15.7-inch deck.