It would look dead.
Look, I’ve got no problem with people who want to go around with flowers in their hair. It’s whimsical and feminine and a bit hippy-dippy, but it’s harmless. Plus, it easily identifies whimsical hippy-dippy types with unerring accuracy, so you can avoid them with ease and professionalism.
I’m not particularly whimsical or hippy-dippyish, so you won’t find me wearing a flower crown any time soon, but even if I were, I’d still have to avoid them. I suffer from hay fever quite badly, so the idea of waltzing around the place with pollen drifting down from just above my eyebrows is my idea of summer hell, to be honest!