Sorry to say but there's plenty of bad advice, in flower the plant needs a different NPK ratio as well as more calcium and magnesium than in veg, so you absolutely want to add those, you also need to help the plant break down these nutrients by using a chelation agent for example beneficial bacteria, enzymes or humic acid. So you always do want to feed three types of things : NPK with the proper ratio, calmag and the additives (chelation agent) . Keep it simple ! In veg NPK ratio should be something like 4:2:2 (more N), in flower it is 2:4:4 (less N) so you do want to switch your NPK. Feed NPK only every three waterings that means feed NPK only once every ten days minimum . For cal mag you can add it more frequently and for the additives that's every watering. For your last 2-3 weeks just water with plain water and you will have a smooth smoke. Hope this helps ! 🚀