Organic nutes doesn't even make sense. Again, "organic" (for lack of better term) is a process. You are relying on the microbiology to supply your roots with food. Basically, you want a bunch of tiny bugs hanging out in your rhizosphere that will exude food for you roots to eat once they are eaten by their predator bugs, or just die naturally. Just cause you dump a bunch of organic material in your soil doesn't mean it will do anything. Chemical fertilizers, however, come along with food that the plants can eat already! So once they get into the rhizosphere what can be absorbed is, and what can't kind of just sits around, and may get used later.
Funny enough, the way that chemical ferts get into a soil is by their electrical charge. Humus and clay particles carry a negative charge, so they attract cations, such as: Ca (calcium) K (potassium) Na (sodium) Mg (magnesium) Fe (iron) NH4 (ammonium) and good ole H (hydrogen). However, what does not get attracted by the humus and clay is Ci (chloride) NO3 (Nitrate) SO4 (sulfate) PO4 (phosphate). What does this have to do with plants? Well, roots have their own electric charge and they exchange their cations for the cations attached to the humus and clay and eat them up! They also attract some of the anions that in your solution, however, a lot of the get displaced due to their charge. The roots exchange their cations, H, for the cations (nutes) in the clay and humus in your soil. The rate at which a plant can do this is referred to as its CEC. A good soil will have a CEC of around 50-100, meaning it will start absorbing the shit out of the nutes around it.
What does this mean? Every time your root exchanges a cation, H, your ph goes up, and your soil becomes more alkaline. Therefore it is necessary, when using nutes, to have a proper balance of cations and anions. That's why dumbass: "PHOSPHOROUS LOAD!!!!!!!!111ONE!" nutes, I've literally seen 0-50-0 in the hydro store, are fucking retarded. You are damaging the shit out of your soil and the excess anions in this case will make your plant look like crap cause it won't absorb the rest of its necessary nutes. Remember, there are 14 different nutes that help the mj plant grow. Not just one. Also, an imbalance of either cations or anions in your soil means that certain, very necessary, microbiology will no longer live in your soil. Because they too carry an electric charge. Balance is the key.
As a side note, don't go crazy with your CEC, 100 is about as much as you want it to be. Once it gets higher than that your soil will have extremely poor drainage and very little room for 02 which is essential for root development. Again, balance is the key. Don't look to grow super duper weed, cause you will end up with schwag. If you know your soil's PH then you know what nutes it needs; however, you could just start with a balanced PH and not do anything to it whatsoever, and if you have enough soil for your plant to grow from start to finish then you'll end up with absolutely no problems through flowering.
The nutes may be claiming to be "organic" b/c they are not salt based and won't kill any of your microbiology. That really doesn't mean shit if you plan on using nutes throughout your whole cycle. What is dieing off due to the salt is being replaced by the nute anyway and doesn't need to be there if you plan on giving your plant nutrition that way. What is a total waste of money though is to have a shit ton of organic matter going and then adding a bunch of chemical shit right on the get go. If you spent time and money making an "organic" mix then you should at least see what it does by just adding water. Remember, with nutes you are still messing with your charge, which you need to be careful about. MAKE SURE the nutes you are using are balanced! I'm pretty sure Mel Frank describes the ratios that you need specifically for cannabis in his books. I really don't know much about the subject of nutes, because I don't find the need to use them all too often. However, Uncle Ben suggests jack's classic. You can tell by his avatar that he knows his shit, so I would go with that.
Really the take home message here is: keep it simple stupid. A large amount of base soil and water is all you need. If you want to go fancy, make a soil mix, let the bugs do their thing for about 2-4 weeks, and test it out. See how it works, and try adding what you think it needs, if it needs anything. Cannabis has been growing 34 million years without human help. And lots of plants that just grow in the wild are actually better looking than a lot of first timers hydro grows because they try to do too much.