Why do you have to sing to a flower?

The reason you have to sing to a flower is because if you don't they will get mad really really mad. So mad that they will over grow and increase the population of plants and take over the world. When they do that they will expand to different planets and soon the universe!!! And that's why we have to sing to plants, good bye. (>:

That's a bit of a stupid answer,But it's really because of Co2 in your breath and it helps it to grow & reproduce.