my plant is 2.5 month old light periods were 18/6 it was growing well and now i changed it to 12/12 n since 2 weeks its not growing at all!! pic is below.. plant is healthy ..i water it as i used to do before!! THE GROWTH IS COMPLETELY STUNNED/STOPPED !!!
And that's a sativa so it sure will......Looks healthy,,,,don't adjust your P&K up till around week 8 of flower and then only make slight adjustments......Boy that'll at least dbl in size by harvest....Be patient..