ok bro heres the low down; you have N deficiency; plant is lime green, lower leaves start yellowing and dieing from the bottom up. and the leaves that are closing is caused by magnese deficiency.
heres how to fix this. go buy some fertalizer, flora-nova grow and bloom are great. but you can run over to wall-mart and buy some commercial fertilizer like miracle grow, try to find one that is highest in K/potassium. i reccomend shultz rose food 18-24-24. it has an almost optimal nute ratio for the whole grow. only use half strength(1/2 tbsp)(900ppm-1500ppm) every other watering. +rep