Hey there Fiori , so when the plant switches into flower it's a good idea to switch NPK fertiliser to flowering ratios , like from 4-2-2 to 2-4-4 . But there are other flowering fertilizers for example PK Boost something like 0-10-10 NPK. That one you should use when the budsites are as fat as your finger. The first one, there are no disadvantages to doing it early, actually switching even during veg can trigger flowering . The second one you have to be careful with because it can burn the plant. but if you follow that advice with the thumb, you wont have any problems. Hope this helps ! 🚀