Here is a clue for the young...
If you are male, and in particular a practical one, forget everything you know.
The entire point of bringing your favorite female flowers is symbolic.
The symbolism is this:
I am thinking about you. Indeed I was thinking about you earlier when I wasn't in your presence. I have brought you a living thing that will die shortly, but have no fear as I will replace it with another living thing and you will forever be delighted by this ritualistic display that I am constantly spending my time, money, and thought all for you.
When the flowers stop, you are sending the opposite message. So you better mean it before you forget those flowers.