I am trying find this out as well so i know when to start flushing the plant, from what i am aware of(not sure still) it's when the tricones on the bud(looks like a tear drop almost when they are clear) are a yellowish cloudy looking. I have been told they go from clear to cloudy, then a yellow cloudy, then smokey. From what i have been told the opt time is when its going from cloudy to yellow cloudy.
Can someone please confirm this for me and tell me when i should start flushing the plant, would imagine it would be before it goes through the stage of cloudy to yellow cloudy???