m0useanswered grow question 2 years ago I like to wait 1 week after doing any HST or a day after any LST if I am going to flip to flower.
This gives the plant time to heal and get ready for the growth spurt its about to preform.
Over all I like to aim to veg for min 5, ideal 7, max 12 weeks. All depends what you plan on doing with the plant.
They are showing sexual maturity as the pistils are out and showing so they are ready to flip whenever you are.
With out this sign, even if you flipped before hand they would not enter flower because they are not mature yet. Like plant puberty.
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Good Luck!