The elements that seem to really improve flavor and aroma have the best effect on cannabis during the middle weeks of flower, so in an 8 week flowering strain that would be weeks 3, 4, 5, and 6. I use Botanicare Sweet during these weeks. I have read before that you can water your plant with a solution of whatever flavor extract you may want, say vanilla for example, 1 hour before harvesting to leave hints of the flavor in the bud. I have not tried this, however, the person that wrote the thread wrote a huge article about using different flavors, and even adding things to the jars during the cure, such as orange zest (shredded orange peel basically). He swore it worked, been interested but I will keep using what I know works. Botanicare sweet comes in berry, grape, and citrus that I know of. Also, be sure to flush 1 week in hydro, 2 weeks in soil before harvest and properly cure for best flavor and bouquet.