Lets not thread jack this and turn it into something its not.... The question was about the Yellowing leaves with a week or 2 left till harvest.... This is TOTALLT normal, and Im quite surprised it didnt start earlier than that.... They might have a ways to go, but a pic would help... I have leaves yellowing as of week 4-5 of flower... If you feel she is ready (you looked at the trichomes), then it all depends on what you use for Nutes as far as the flush... As stated above, if you do all organic, there really isnt a need to flush, because there arent any harsh chemicals to be flushed out.... However, if you are using Advanced or House and Garden etc... you need to flush WELL. There are alot of ways to do it, most people just use PH'd water for the last week.... I do it faster... I use "Final Phase" which is a flushing agent made by Advanced.... I water them with that once... Then 2 days in a row of Water only, then chop em... If you dont flush when using chemical nutrients, the smoke tastes like ass, and burns terribly... Instead of burning to a grey ash, it will turn into black charcoal... Bla... After spending months on a grow, dont blow it by not flushing..