Robot mower leaves clumps of grass instead of finely mulching.

Safety first: Turn OFF the mower and wear gloves.

• Replace blades: Install new sharp blades to improve cutting and mulching.
• Mow when dry: Schedule mowing when the lawn is dry to prevent clumping.
• Raise cutting height: Increase height and gradually lower over several days.
• Increase frequency: Set the mower to run more often so it cuts smaller amounts each time.

Consistent clumping after these changes may indicate the mower is undersized for the lawn density.