Its fading because its using its enegy to make buds it looks like. I am not sure what to do with soil but in hydro, this is when we slowly lower the nitrogen and increase potassium and phosphorus we give them. Fade is normal when budding, make sure PH is always on point
Just harvested all 3 of the autos i was growing! Had GSC and GG4 in tent and the sour diesel was in my grobo. The sour diesel was a freebie from seedmans and it had some big buds on it!