this is coco,you are growing in coco and you think they don't need any food until week 4. You should start feeding it right away. coconut doesn't have nutrients in it,very aerated and needs to be fertilized frequently for a good growth. You've done the same with your strawberry tree plant,didn't feed it until week 4 but thanks to it being a photoperiod,you vegged it long enough to recover and find its vigour before flowering.You don't have the same chance with autos, you should have fed it by now. Keep this in mind. cannabis in full coco needs to be fed from day 1. Check out my diaries when you have time. Straight feeding from start.