Also to add to all the great posts.......
When in flowering, you want to give it real little N, as to the P and K....You still want your plants to be getting some nitrogen, but not a whole lot! You eventually want to be using little to none as you progress during the flowering process.
Also helps in getting that chlorophyll out quicker during the drying and curing process! Too much nutes and you will have to deal with more chlorophyll, which CAN (not saying it will) slow the process when you harvest! Also, remember....Flush, flush, flush! ESPECIALLY towards the end!
"Make the most of the Indian Hemp Seed and sow it every where."
- George Washington
"A dope fiend refers to the reefer butt as a roach, because, it resembles a cockroach." L. Ron Bumquist: Fear and Loathing in Las Vegas