the hormones that tell roots to grow stop producing about 3-4 weeks into floweror just after the initial fruit starts to develope, i have been told
hard to repeat this stuff without real data
i have done test of plants planted in various sized pots . .same strain
a quart root mass, in my environment, will grow to a five gallon sized root ball in 3-4 weeks during the intial flower
the seven didn't finish, filling out, and the three was concrete by the time it was done
i didnt notice any further growth but thats just my observation no clear cut science