I just transplanted 4 plants from 1.5gal plastic pots to 10gal fabric pots. My intuition is that I should give these plants 14-21 days to fill out the pots and get bigger before flipping to flower. I don't know where I got the notion that root growth slows down after the flowering stretch is over but that would make my goal to have a "mature" rootball 5-6 weeks after transplant. Can anyone confirm or refute this concept?
The soil is Coast of Maine Stonington blend with bio-char, perlite, vermiculite, and Gaia Green dry amendments.
Thanks in advance for any incite here.

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It definitely does help, thank you. I'll probably give it 21 days and flip. I'd be happy if I got the same size plants that I had in 7 gal fabric pots last time, but with a bigger pantry. Quality over quantity.
I can’t confirm with actual citings from literature but your knowledge or theory is sound in the fact that root growth slows then. I would say that 21-30 days of veg after your transplant would be minimum if you’re going for max size/yield. It takes longer than you would think to fill that size pot.
Hope this assists you in some way. I like the fresh topic. Not the same old “help“ lol
Skal 🌱🪴🤙🏻