My BB strain hated nutes until about 4-5 nodes, once she started to flower there was no stopping her, i upped the nutes about 300 ppms a week until i hit 1800ppms half way through flower where she sits now, Alot of the strains u buy dont like nutes for a couple weeks i would up the nutes when you can see that there getting big enough to handle it, ussually i dont go abouve 800ppms in vegg my BB when put into flower was at 600ppms a foot tall. So i mean its how well you understand your plants growth.