There’s a long-standing tradition where Deborah Henson-Conant comes from, and it goes like this:
On your birthday, someone gives you a rose and your job is to head out for a long walk and take this rose with you. It’s generally better if you’re in a city with a lot of people around, because your job is to find the person who belongs to that rose. And when you find them, you explain this is your Birthday Rose — and if they’ll take it, then you get to make a wish and they get to make a wish, and both those wishes will come true.
Just don’t try to find exactly where she’s coming from.
(You’ve perhaps seen this flower before.)