Cultivation
Watering with plain water in the final weeks before harvest to clear excess nutrients from the plant.
Flushing is the practice of giving plants plain, pH-balanced water (no nutrients) for roughly the last one to two weeks before harvest. The goal is to use up nutrients stored in the plant so the finished flower burns cleaner and tastes smoother. Flushing is more important in synthetic-nutrient grows than in organic soil. The technique is debated, but many growers report a noticeably smoother smoke from flushed flower.