Talk:Coffee Beans/@comment-124.150.119.67-20121115062519/@comment-5574324-20121115143143

They don't. They're there just in case it is Aurelia or Ferru growing. Those three plants look identical, and the other two require one of the two ores to fully mature. If Aurelia or Ferru is there, rather than Coffee, as one may suspect, it will never fully mature, wasting your time. If, however, you have full plots of Coffee and just harvest them without cross-breeding, there's no need to put the ores there.