im in my 3rd week of flowering a single outdoor plant. ive had this problem with indoor plants and am not sure if its natural or a nitrogen/ other nutrient deficiency, or a ph problem. about 2-3 weeks into the flowering process the bigger, older leaves at the bottom of the plant are yellowing, almost the entire leaf. i know that when older leaves begin to yellow between the veins that a nitrogen deficiency is probably the reason, if ph is not the problem. anyone know if this is natural in flowering or if there is a deficiency?