Benzelsanswered grow question 3 years ago Ahh good old Nrth Lghts. Lovely fast finisher, lets see, shit its been 10 years since I grew this.. umm... u can chop her at 8 weeks from memory if your cash cropping but shes better at 9 weeks and 10 is too long. Unless u want to feel like ur face is melting (in a good way). lols, If your around week 8 now, just run plain water for a week and then chop her. Or if your in a hurry and ur in week 7, you can start the flush now.