lol, i can understand peoples unwillingness to overdose their plants on artificial sugars that could potentially fuck up their grow
Basically if your trying to fuck with flavoring your pot, you dont do it during the grow process, you do it just one or two days before you chop your plant down. You have to use a Flavor Extract -- Take Vanilla for example, this seemed to be the most popular flavor with the best results. You let your plants dry out, as you normally would right before chop. On the day of chop (this seems to work best from what ive read), you take your Vanilla extract, and you add it to a pure water solution, something like a couple tablespoons per gallon of water. 2 hours maybe before you intend on cutting the plants down, water them with this new vanilla flavored water. The plants will soak up more than enough of the water with vanilla in it in that 2 hour timespace. If you leave it for more than two hours, you increase your chances of bacteria and mould forming in your nuggets because of the excess amount of artificial sugars being introduced to the plants right before you cut them down.
So 2 hours, no more than that really is a good idea to wait to flavor your pot. There are a couple other ways, but they all involve waiting until the last day or two days before chop, but this method is the most effective.