When do plants stop growing vertically?

Im 12 days into flowering and i only have about 15" left for them to grow. I also have one sativa in the bunch that i think could f up the canopy.

Just bend the main down. I did this 4 days ago 3 weeks into flowering and they came right back into the light the next day they are doing good and also gave light to the side shoots so all have little buds on them. if you bend and it staps dont worry it will be facing upward in the morrning thats what happend to me good luck man......

when there half way done flowering they should pretty much be as tall as they will get and just start dropping fan leaves slowly while buds are fattening up


Look up lst(low stress training) thats when you tie branches down