Nasturtium

Roses are obviously cliché.

White lilies seem too simple and purple too bold.

Daffodils, her favorite, would be a good choice, but they would make him feel like he's just getting brownie points.

He could default to daisies, but they look a little shriveled.

Geraniums look bunchy.

Marigolds smell funny.

Black-eyed Susans look like weeds.

The tulips look wooden.

He is sure he is hyperventilating. He cannot choose a stupid flower for Bones. He should just get chocolate.

An hour later, Booth thrusts a pot of orange and pink nasturtiums into Brennan's arms. She raises an eyebrow and smiles.