[@TheWindel]
They are made of blood.

[quote]
<Snipped quote by Banana>

Do I need to answer that one? Obviously you can't control others' powers. Not only is that a big problem from an etiquette side [u][i]but also those roses are made of blood[/i][/u], so they aren't normal plants.
[/quote]

And the only idea that these are different are really their colors and waht they do. These are purple, and they embody nothingness.

[quote]
[color=a187be]"Just you wait, there's far more from where this one came from,"[/color] Helena shouted. She disappeared from her place at the tribune, leaving a burst of rose petals behind her as she reappeared above one of the many tall columns that dotted the arena floor.

[color=a187be]"If you want to test my mettle, you are more than welcome to bring it on,"[/color] Helena said as the faint perfume of roses filled the stadium as the columns in which Helena stood became covered in flowering hedges.[/quote]

They're incredibly similar as to what we've seen, and the only thing left out was how they got there.