Most of the girls like beautiful flowers, to make a girl happy sending flowers to her is a very effective way. When I am in a realtionship with my boyfriend, he always send me flowers to make me happy, our realtionship is always very good. We love each other very much, and flowers have become an effective tool when we have an arguement. I have read a very good article about the advice for men to send flowers to girls, if you are interested in it , you can read here: http://www.flowersofchina.com/sending-flowers-advice.htm