The small one is gone into flower and started to reveg already. Dont know why but a few of my plants have gone into flower and started to reveg this season. Even with the nutrients being upped the color of these plants is not that vibrant green could be the genetics.
Yes by the end of flowering the plant is tending to get yellow because she don't need use lot of nitrogen and she is trying to achieve senescence which is the total yellowing of the plant before she dies