when to fertilize

that fully depends on the setup.. if you grow in pre-fertilized soil, then you can wait for a few weeks, while on the other hand if you use coco or pure hydroponics, you will have to start mixing that solution basically from the beginning.. in any ways, take it easy at first to not overfeed them as this is worse than underfeeding (which can be corrected more easily). also many feeding schedules on the back of nutrient-manufacturers are meant for hydroponics, so quite often there's a comment "for soil use half" or similar, while i think that's even too much quite often.. I really like this link the tests they have done and the info they provide: https://www.mandalaseeds.com/Guides/Fertilizing-Smart-Guide You might want to read through that.