Does anyone know why some maples hold onto their dead dried out leaves while most maples drop their spent leaves in the Fall? My Takinogawa is completely leafed out and yet it still has quite a few dead dried up leaves from last year. I have a few other maples that do the same thing and I have often wondered why. What benefit would holding onto the old dead leaves have for some trees? I have tried to read about this and I think abscissic acid is involved in dead leaf retention among other things but if someone knows anything about this, I would love to hear your thoughts.