listen to these guys, i ussually dont flush becuase i use organics, but i still flush 2-3 days before harvest with distilled water. And i flush when i see all hazy tricomes. It depends on what kinda high your plant produces and what strengths your looking for, they color has some relevance to body head high and inbetween, the hazy color is ussually inbetween but alot go for the sative high where your tri's should be mostly amber. Most ppl who have a select strain take samples at different harvest times to see what high there really going to get.