every spring, two weeks before the aerating season starts. People hardly ever receive a personal letter anymore these days, so I know that 100% of my letters get read! I get up to 90% repeat business in this manner. I also get fantastic referrals as the customer is so surprised in receiving a handwritten letter from some fellow who only did their lawn last year they tend to tell several of their friends. Most people would agree this is a great way to secure repeat business.