We are all born with it. When we see flowers we want to pick them and give them to Mommy. I did it when I was little...now I'm the happy recipient.
It didn't take long after Eden was old enough to pick flowers and walk over and hand them to me, that I decided I would always be prepared to receive them. For about as long as I've been a mom, I've always had cute, tiny bottles or vases in my kitchen window--some extra short for the flowers that "come without stems". I LOVE IT! I LOVE IT WHEN THEY BRING ME FLOWERS! I LOVE FLOWERS! I LOVE MY KIDS!
I usually say in a somewhat-loud high-pitched voice "Oh thank you!!! This is the best day EVER!" They know I appreciate it and they love to make me all happy and excited!