There is a very good article on persuasion that should be of interest to any florist who is running a loyalty or incentive program. Point number five in the article is especially relevant:

Make people feel as if they've already made progress toward a goal. A car wash offering a loyalty card nearly doubled customer retention by changing their offer from "Buy eight washes, get one free" to "Buy 10 washes, get one free—and we'll start you off by crediting you for two washes."

If you are currently running the kind of "buy ten dozen, get the next one free" program popular with many florists think about this advice and stamp their card an extra couple of times when they first join the program. If you are worried that will get too expensive then change your program - instead of requiring ten purchases switch it to twelve (buy a dozen dozen...) and give them two stamps for free.

If you are using FloristWare to run your program you are in even better shape - this is exactly what the New Customer Bonus Points feature is for. You can tell FloristWare to credit new program members with bonus points.