Whether you can call a girl "sunflower" depends entirely on the context and your relationship with her.
- If you are close friends or romantically interested, it can be a sweet and affectionate nickname. Think of it as a way to express admiration for her bright and cheerful personality.
- However, if you are not close to her, it might be perceived as awkward or even inappropriate.
Ultimately, the best way to know if it's okay to call a girl "sunflower" is to simply ask her!