Something else you might want to think about: cut flowers die. An ivy (or similiarly easy to care for plant) in a decorative planter (especially when touched up with balloons or silk flowers) is something that lasts substantially longer. Right there you avoid the whole potential “flower” stigma, AND give her a constant reminder of how groovy you are to be thinking about her.
Miniature rosebushes, bromeliads, and African violets are also other good choices that get the flowers into the scene as well, and the bromeliad is a nicely exotic twist on things.
Before we were stuck in a tiny apartment, my husband never bought me roses (I always hated having to face them dying to make me happy). Instead, every year, I’d get a new rosebush that would continue to produce flowers for years to follow. The smell was always sweeter that way, too, since most commercial long-stem roses have been so overbred to produce the perfect Look, that they’ve bred the fragrance right out of them. I’m SO much happier with a plant over cut flowers.
But show up at my door with a few hundred daisies and sunflowers, and I’m yours. Something about them = portable sunshine, and they work every time.