Yes, you can mulch wet leaves, but we advise against it. Wet leaves create more friction in the machines working parts, causing the mulcher motor to work harder. Sure, that might not be a problem from time to time, but consistently mulching wet leaves results in the premature failure of your mulchers motor. If you want to mulch wet leaves, it’s a better idea to go with a standalone model featuring a powerful motor and dedicated mulching action. Avoid the 3-in-1 handheld machines for this task.