When should I use Flowering nutes

What I have been doing for close to thirty years and what works well in my experience/opinion........... Continue with grow nutrients until there are small budlets/tufts of white pistils formed, - cannabis still needs adequate nitrogen in early flower. After this I switch to half grow and half bloom for the following 2-3 weeks (depending on flowering speed) and only then finally change to straight bloom nutrients through until maturity. This seems to produce the biggest blooms on plants that don't exhaust themselves and end up a sickly yellow colour by harvest time. Switching to bloom nutrients as soon as the first pistils appear is a mistake in my opinion. Hope this helps, Organoman.