When does flowering technically begin?

Curious to hear others perspective on when flowering begins with autoflower genetics? I’m about 4 weeks in to a grow with auto blueberry from IloveGM among auto northern lights and auto amnesia haze. The blueberry has put out pistils already as shown in the picture. I am trying to determine when to switch fertilizer from a vegatative mix to a flowering mix.

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When you see little buttons like this you are in flowering.

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Are you running a different fertilizer blend during flowering than you did during vegetation? If so when did you switch? No little buttons yet but lots of initial pistils.

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They’ll show up slowly. :grin::v:

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