Final flushing with only water is bad practice because it deprives the plant of food while it has to expend a lot of energy producing cannabinoids and terpenes. The longer it takes, the more it affects the quality of the flowers.
Using a finishing product, such as Power Clean from Bio Tech or Flawless Finish from ADN, will help the plant to assimilate the remaining fertiliser in the soil and clean the substrate for subsequent crops. But a whole week is too long, and I generally cut back after 3 or 4 days.
However, a more effective technique for improving the taste is to cut your plants in the dark, just before sunrise, and wait half an hour before showing your cut flowers the light. The plants will then have less sap in their system and therefore less fertiliser and less chlorophyll.
> Ppl who say don't flush. Usually are not smoking it.
Smoking ruins the taste anyway, try dry herb vaporizer. 😍