I'm not sure nutes are ever really "needed" when growing in a good soil. My noob plan is to use Subcool Super Soil recipe and not worry about messing with nutes at all. If you were to buy a decent organic soil, mix in some Earthworm castings, bat guano, blood and bone meal with it, just add water, and you should be good to go.
Haven't heard of Jungle Growth... i use Roots Organic which is great stuff. Expensive though.