WHY: The idea behind flushing is to let your plants “use up” any extra nutrients contained in the plant and buds. This way there is a much lower level of nutrients left over after harvest, and it’s those extra nutrients that can change the smell, taste, or (most often) “smoothness” of your buds in a negative way. WHEN: Wait until the plant already looks like it’s at the early end of the harvest window, in other words, wait to start the flush until you could pretty much harvest the buds right now if you wanted.HOW: Provide only plain pH’ed water to plant until harvest (from a few days to 2 weeks)