Will seeds start just producing buds while in a 20/4 light 'weeks away still' mode, then I cut back to 12/12 and the buds grow bigger

A customer has a question and I hope we can get some opinions on it, thanks

Received product 1 week ago and they are already standing tall and proud. 1 each , 2 vast & a banana k.
My question is will these start just producing buds while in a 20/4 light ‘weeks away still’ mode, then I cut back to 12/12 and the buds grow bigger

It would depend on weather you’re growing autos or photos. Autos will flower under their own time schedule regardless of light cycle. Photos, on the other hand, will veg under 18/6, 20/4, etc. until you flip their schedule to 12/12 to induce flowering.

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You can keep photoperiod plants in 20/4 or 18/6 for years, and they never bloom. That’s how we keep mother plants for cloning.