A single-member LLC affords you almost zero protection against torts based on your actions. If an employee does something, you have some degree of protection as long as you have kept your business and personal finances completely separate. In other words, your receipts for trimmer line doesn't have sodas for the kids on them, you're cutting a paycheck for yourself each week instead of just transferring random amounts of money to your personal account, etc. Unfortunately, a good lawyer can tear down most single-member LLCs out there.
Liberty Lawnworks, LLC
"Don't be so busy making a living that you don't have time to make a life."