How can i tell if my rose of sharon is going to grow into a giant tree/shrub?

This should do it. a href="http://www.ehow.com/how_2070382_grow-rose-sharon.html" rel="nofollow"http://www.ehow.com/how_2070382_grow-ros…/a they do start life as scrawny twigs but they DO get big. Good luck!