When should I start feeding nutes?

I've asked this same question and honestly it depends on your setup. Looks like you're running with soil. Depending on the soil/most soils it will keep her going for a good 3 to 4 weeks. I would generally start there. Remember to start a 1/4 strength then if all goes well increase slowly to 1/2 tbsp and so on... Around this time the plant has taken up what nutrients are left in the soil as she should be growing vigorously at this point. Watering the first week or 2 I preferably used a dropper. Don't water the whole medium. Remember her roots are small at this time. Give her a few drops the first day then progress as she drinks. Drop near her root zone and go from there. As she progressed I used a measuring cup and started with a half a cup of water and progressed from there! Less is more I've realized from growing. Hope that helps! 👍