It's always nice when you receive a gift. It is even more enjoyable when you receive an unexpected gift. Competition is everywhere. There is someone out there right now who wants your customers. It is your job to keep them happy. Show your clients you appreciate them. It does not have to be anything expensive or elaborate - maybe a free mowing, or a gift certificate, or a pumpkin, with a small note saying "thanks". Simple gestures like this go a long way.