I tried some classified ads in the two big gardening mags out here, not a call over 12 months. Spend a lot of time with the local landscape association, great for contacts, get some referrals. Hang out at a few big garden centers once in a while, buy the guys/gals (in the nursery and the pesticide dept) a round of coffees or ice creams in the Summer, GREAT for referrals. I do tons of pruning in the Winter, calls for fruit trees etc I just tell them ok, here is the price to do the job (I stay away from time commitments if I can help it) and let me see now, oh yes, I will be here January ?? until I fill up the months of Jan to March, start filling in weekends if it gets too booked up. Call a couple days in advance to let them know I am coming. Lost a couple over the last few years to on the spot pruners but most I call in the winter and they cant wait to see me. Most of my Spring/Summer work is install jobs and fall I do cleanups and pruning work, still have a few installs as the weather holds too. I also go to a big garden center that I live close to, work for the christmas tree season (2 1/2 weeks over Dec) selling trees and do my own thing on my days off, again, GREAT for referrals come Spring.