How do you know when it’s time to start flushing?

I understand that you need to flush one to two weeks before harvest. But how do you know when to start the flush? Are there certain things in the plant that you look for (i.e., when trichomes start to get cloudy)?

Usually once you have mostly milky trichs ( 75% ), amber ( 25% ) is a good time to start flushing. Maybe even before then because by the time you finish flushing, the trichs would have changed. Try not to go by the seed suppliers date because those time frames are more of a guideline, not necessarily engraved in stone.