Cold calls were outlawed 5 years ago. You can only call your customers...unless you are a charity or politician. TruGreen and other lawn companies helped to cause this law to be enacted. Too many calls. I called thousands myself--worked well at first.
You have to use flyers or brochures. Or first class mail. Or knock on doors. And a good referral program. Your competition will have lots of flyers. Make sure yours is the best.