[quote=@Banana]
[@KoL]
If he had time to study a singular rose, he could probably do it within a good amount of time, but in this case we don't have that, so...

Eh, he'll have to steal one next battle Victoire is in.
[/quote]

He can try to, but let me remember that he can't keep them without her consent. If Victoire commands, they'll become blood once again, if she dies or has her control over them stolen they'll wither, or become blood, depending on the flavor of the scene. And lastly, they need to be watered with actual blood to remain alive, he would have a really daunting task ahead of him to steal and keep her roses without her will.