a new and distinct cultivar of hydrangea macrophylla plant named ‘ piihm - ii ’, characterized by its remontant trait , flowering on old wood and new growth of the season ; dark pink mophead inflorescences in non - aluminum based media and violet - purple inflorescences in aluminum based media ; inflorescences that age to rose - red and remain showy for an extended period of time ; compact , rounded to spreading growth habit ; dark green foliage ; red stems ; and resistance to powdery mildew .