Yeah, no need to flush but slowly drop nute levels about week 5-6. We 3nd up around 200 ppm at the very last week.
As.someone eluded to above, plants need nutrients in order to properly break down chlorophyll when you dry them out.
Good tasting bud is about a nice SLOW dry, not about flushing "30 days" before harvest. Those guys with the totally yellow plants at the end... fail.
Just another stupid pot head myth...like organic soil grown has soo much better flavor.
Happy growing and a little bud porn from today's harvest