Most of us must have given a flower or a flower for someone. For example giving a red rose to the lover on valentine's day. For us men, maybe it would be normal for a woman to give us roses. But for a woman, if you get a gift from a man's rose, they will interpret the gift in a very deep and very meaningful for them. 
So before you give flowers to someone, you better know the purpose, and can adjust the goal with the right interest.
Women just looking the colour of flowers.