m0useanswered grow question 3 years ago Yes, you can run 18/6 the entire grow, A lot of growers do exactly this.
They do not require a photoperiod switch like photoperiod plants.
This is because of their ruderalis genetics bred into the plant.
Some people also grow start-finish on 20/4 or even 24/0 with autos.
my favourite is 18/6 I feel the plants need a rest period.
Best Of Luck!