Sorry, I should have been more clear...I was refering to flushing to remove salts, which I do monthly using Fox Farms, as the nutrient salts tend to accumulate.

Some flush a week before harvest, some 2 weeks before. I always flush to remove nutrients from the soil for a few days (3-5...whatever fits my schedule) before harvest. I cure my buds, so am not overly concerned with the flavors from smoking my meds before the process is complete.