Hi there Franken, In soil you really dont really need to feed the first four weeks, but you'll probably want to repot the plant by then, since you're using amended soil you dont need any NPK. For micronutrients it depends on your light schedule, so if you have an intense one it might be a good thing to add it in or as a spray up to twice a week. If you think she might need nutrients another thing you can do is to use additives instead of NPK to "unlock" the nutrients already in the soil. My favorite additives are enzymes, humic acid and beneficial bacteria or trichoderma harzianium . So when you repot into fresh soil, you probably have a fresh four week period ahead of you before you need to feed again. That might depend on your run off, i just water with plain water no run off... hope this helps ! 🚀