The only info I have on growing them is that full sun is best, but morning sun is essential to burn off the dew as fast as possible, else you get black leaf and other molds.  And planting parsley around the base keeps buggies off.  And, here [in Kentucky] in mid July we cut them back pretty hard before the Japanese Beetles come out to mate, else they will mow them down! If you cut them back, lopping off all blooms, then there is nothing for [the beetles] to eat, and the roses will return in a month and continue growing throughout fall.  Fall is really the best rose time!!!!