No you don't need nutes to grow weed as it's weed and it'll usually grow without it. They add nutes to maximize yield which is where the problems start specially when you're a new grower. you add too much of something, not enought of something else, amounts may be off and .... . So you come back to site and ask about problems your plants will have. That being said for first grow, I'd stick with a simple feeding schedule and brand like FoxFarm, its expensive(relatively) but much simpler than some others. look up foxfarm, grow big, big bloom and tiger bloom to start with and when about to flower the sesame, chaching and beastie blooms. These do drop you water PH so be sure to have a PH meter on hand, try to use RO water or distilled water to avoid excessive salt/mineral build up in your soil, avoid crappy high added nutrition soil and be sure to have most necessary equiptments on hand before you start ur grow.