Mother Nature cares for their Childs, as soon as the sunhours goinmg down , the plant get the signal to end( building flowers) I dont know where you live, but here in northern europe it starts around beginning of august... plants start flowering then in middle/ end of august. You can fasten that progress in giving her darkness after 12 hours ( daily) its called Light deprivation,,,, and so the grower does what nature does too.