well yeah they right in a way!
the leaves go purple at the end of the flowering period, just like a tree goes yellow red purple ect in autumn. however, the heat of the grow room has everything to do with this too, the cooler the room the more the purple will apear, it the same for all of the more natural blues, like citral,mine were almost black all over , where as my friends didnt get hardly any colour, I have aircon, he doesnt[didn't]
blue berry is as tall as you grow it!
it also works great for SOG and single colas!
good luck.