how do i know when there ready for flushing?

hello people im growing some ak47 and im not sure when to start flushing the big main leaves have started to die off at the bottom now loadz off bud and crystals how do i know when there ready for flushing and the chop??

u usually flush around the last week or two of flowering

And if you are not sure when you put them in flower use an application called herbhq you can find it in a sticky on this forum called free grow software. It's a great application.

i no when i put them into flowering but im not sure how long they should flower for ak47 that is??