So have grown a plant from a seed to something about 2 ft tall. Seems to be going well but the leafs on lower sections of the branches are dried brown. And dead. The tops are heathy and green, not sure whats happening here. Any help would be appreciated, i am watering with distilled water and only when dry, it’s outside in the sun 7 days per week, about 12 hours. The plant is about 9 months old.