I think it has little to do with health or environment, and more to do with the size and age of the plant and how often u top it, the more u top the longer the 3 to 5 fingers leaves stay, I have notice over the years if the OG plant is left to grow without topping very often and after it gets over 2ft tall it will throw the 7 finger leaves and sometimes even 9, the TK is that way, it just started throwing 7 leaves right now, and the plants are about 26+ inches now, both in the flower room and in the mother room, they started throwing 7 fingers at the same time and same size....................GM