When is a plant considered flowering?

when the bud sites explode in flower

some breeders call the start of flower from flip and some call it from the start of actual flowering, usually ~10 days after flip.

I usually start by mixing veg/bloom nutes (at 1/2 concentration each) during transition and then go straight bloom once the flowers show up. This new line of nutes I am using recommends a completely different nute (10-30-20) during transition, but I think its the same as mixing, like I said.

 

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@Dry Sift Box and The Clamshell

 

If you're seeing pistils, the plant has begun to flower. Be careful not to over fertilize by cutting back a bit on the nutes, it's better to under fertilize than over fertilize. Check out the nutrient threads on the forum. Harvesting will still be a long ways off, (probably about 8 wks depending on strain) but you're on the way! Whenever you ask questions about your plant/s, it's always a good idea to post pics, so others can see what you've got with their own eyeballs.