Most outdoor growers use a combination of organics and mineral salts, it's probably the most common way cannabis has been grown outdoors through modern history. I know lots of guys who amend their outdoor plots with compost, manure, alfalfa pellets, sul-po-mag, etc, then give a dose of Jacks or whatever once a week or so through bloom. You get the best of both worlds, that good outdoor flavor and bigger buds. I know a lot of organic "purists" hate the idea, but it works, and studies that compare strict organic growing with a supplemented microbiome to mineral salt supplementation in that same soil always favor the mineral salts in terms of yield. It's a myth that mineral salts "kill" a microbiome-certainly, high phosphorus has been shown to suppress the microbiome, but it's still there working hard for your plants. When I grow outdoors, I grow organically, but I don't care about yield-the yield I get is way more than I need. But I can see why people who are in it for the money use a combination of methods. The studies being carried out on the microbiome have shown that mineral salts can be reduced (by 25% in one study I recall) without a drop in yield, if the microbiome is supplemented, which is good for our soil health and watersheds. But more importantly, the heavy metal load of organic inputs (and some mineral salts) needs to be addressed. Organic soils often show dangerously high levels of arsenic and cadmium, which just go up year after year as more seaweed and rock phosphate (among many other questionable inputs) are added. There is a dark side to organic agriculture. I'm not advocating conventional agriculture by any means, since 70+ years of the "green revolution" has polluted most agricultural soil in the world with high levels of heavy metals-many mineral salt fertilizers are tainted too. The problem stems from allowing a "minimum" amount of allowable heavy metals instead of having a zero tolerance policy-even a "minimum" amount of arsenic and cadmium (again, among many others) will build up to dangerous levels given enough time.