when should i start my flush process?

IMG_20190918_082440.jpg Im at what i belive to be either week 5 or 6 of flower judging by the looks of the buds and by others grows online of the same strains. To start off i have 3 different strains 2 northern lights that suposedly finish between 9-11 weeks and then a lemon kush and a skunk both these online state they are mature around late september to mid october its september 18th week 6 day 1 into the week and im just wondering when i should flush them? Im expecting the northern lights to go longer but if i chance it ill end up with nute filled buds that are harsher and i dont want that i want smooth smoke. The northern lights have 40% dead hairs and im not sure if its producing more or not seems like it and the other strains are next to eachother they are dying at the ends on some hairs then the others are still white and its definitly making more. Ive also been looking at my trics and they are telling me shes ready now but some people have said that they matter others say they die and new ones come back while the buds get bigger i dont know whats righr just need ideas on what to do thanks.
 
Depends how large of a pot your growing in and how long you want plants to go . As well as how often/much you feed plants.

Typical rule is to flush with clean water only (RO water best) 2 weeks before harvest.

I do 15 days of clean water every day.
Then allow 1-2 days to dry out some before harvesting on day 17


Don’t rush it! A lot of time plants look done because of lots of red hairs but you really can’t tell without looking at trichs.

Cloudy Trichs she’s ready.

Best Of luck
 
Around 2 weeks in soil, a week in coco, a few days plain hydro. I'll be doing my last feed tomorrow in soil, shooting for the 2nd week of Oct. for harvest.
This is helpful thank you i was planning on harvesting one of my smaller plants around this time if it wasnt exactly ready because i want to have some more uplifting high
 
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