3 weeks into flower is not good the normal yellowing is very late in flower not at the beginning of the cycle. The lack of chlorophyll will stunt the flower development at this cycle and the plant will not be able to produce the needed carbs and process stored energy it needs to survive.

What are you using as your base NPK nutrient?
What portions are you using?
What soil type are you using?
What is your Ph of the soil?
Zandor Reviewed by Zandor on . to much yellow :confused: nearly every leaf is yellow on every plant 3weeks in to flower had water prob ripped out the softener then got spider mite and now this. ionics food grow and bloom just tryed more grow dont no if they will make it any input gratley appreciated:) Rating: 5