What flower means fuck you?

Foliage

 "Okay, so that's the roses and lilies and carnations," Katsuki said, ringing everything up. "You sure you don't want me to arrange that for you as well? It will only cost-" 

 "Mais non," the man said flicking his blonde hair out of his face. "I'm going to arrange them myself. No offense to your skills, but I highly doubt you'll be able to capture my vision!" He struck a bizarre sort of pose in front of the counter with his eyes closed and his hand pressed on his face, as if Katsuki was going to whip out his camera and take his picture and upload to instagram. Instead of what he was actually doing, which was standing behind the counter and struggling to keep a pleasant expression on his face. 

 "Right," Katsuki said, counting to ten in his head. "So, cash or card?"

The customer whipped out his card and held it in two elegant fingers. Katsuki rang him up and handed over the flowers with a wide smile, telling him to have a great day and come back soon. And as soon as the door closed, his face dropped to a scowl.

 "Those flowers are going to look like shit together," he said to the empty shop. "You can't just buy a bunch of flowers and stick them together, you need balance you showy bastard! And you need green! You need fucking foliage to offset everything. Goddammit! He slammed the cash register closed and headed to the other side of the room to continue working on the arrangements people have ordered.

Yay!!! My first work!!!