I'm certain they do. She is using them to make potions, after all.

[Tumnus' nose was tickled a bit by the pollen, though he didn't lower his head to get a better whiff. He merely tucked the buds away from him a bit more, then gestured for them to leave. Her dress was thin enough that he felt it would dry as they walked.]

Be careful, my dear. You wouldn't want to wind up getting tippled by a flower.