Dr. Atomic Northern Lights #5 (Final Week??)

I am using a bloombox with Dr. Atomic Northern Lights #5 seeds. Things are looking good. I just started to flush the plant yesterday. Is this the final week before I cut her down?

flush hydro for a week, changing out the water at least once durring that week works for me.

you wanna flush 21 days to get rid of any build up inside the plant otherwise smoke will be foul