But why do plants crave it? Because...it's got electrolytes! Lmao Idiocracy should have been a horror film instead of a comedy the world is getting there slowly but surely.
But on a serious note dude, the term flush does exactly what means flush's the roots from all unwanted salts and whatnot to increase flavor.
The plant has PLENTY of great flavor by itself additives are not necessary unless you want to deal with messy molasses (unsulphered). There are very few shortcuts when it comes to growing properly bro just look at it this way do you want to wait 3+months for shit that tastes like ass and wont get you high or do you want to grow some shit that's gonna knock you on your ass and tastes like god's vagina? If you want what i think you do than don't listen to anymore of your friends who are trying to give your plants gatorade and only find reputable sources for you're information.
I personally have gathered a TON of info from this site as well as youtube.com if you search for a time lapse video of the strain you are growing or similar it will help you gauge when it's ready and all that.
SPREAD THE SEED!