I am prepareing formy first harvest, I am in the 6th week of flowering, and from what I can tell the top 1/3rd of one of my girls is going to finish in about 2 weeks ( for 8 weeks of flowering) but the rest of the plant could probably go another 2 weeks after taht (10 weeks total)... How should I do this?? Does the plant need to be flushed prior to taking the top portion? I am not using organics.... any help appreciated