Can of worms here. I have debated this for years. HUGE issue in the US is that 'organic' is a label controlled and 'owned' by the USDA. Whatever they say ORGANIC is, goes. Which here makes no sense. I mean, organic from a chemistry perceptive means any molecule with carbon in it. But the USDA says something else. As stated by others here, sulfur is considered organic and can be dumped on plants. Same with azadirachtin, one of the prime ingredients in raw (but not refined) Neem oil. You can dump it on. However, aza is a pesticide and some claim that it causes Cannabinoid Hypermesis Syndrone and hence makes you sick. Ooooh, but its natural and organic, so it must be good, right? No... I know several organic growers that quit growing organic because of what they allow and do not allow in/for organic labeling. The flip side is Abamectin, the main ingredient in Avid. It naturally occurs in soil bacteria. So it should be organic, right? But nooooooooooo. Sorry. It is synthesized instead of extracted, so it is not organic. Too expensive to grow bacteria and extract it. Even though it would be EXACTLY THE SAME COMPOUND. But no... we cannot have anything that actually makes sense these days. Politics forbids that. Avid is good stuff, and the ONLY stuff that controls broad mites here. Also it is photo degraded rapidly (as stated by Cornell University in the results of many tests) and only stays in the plant for a few weeks at most. And it stays in the leaves that are sprayed, so when you spray the sun leaves it does not migrate to the flowers. I know many growers that use it and get their weed tested after harvesting and it does not show up in testing. But it is not organic. They use it here anyway.
Now that is for pesticides (including miticides and fungicides). When it comes to plant food? Well, my horticulture and plant education from the University or California at Davis and Oregon State University say the same thing. That plants take up nutrients the same, regardless of if they are organic, synthetic or inorganic. UC Davis tests show that plants fed inorganic, organic and synthetically derived foods react the same and grow the same. I know, there will be screaming and ranting as a result of my posting this from the organic cult. But it is true. Tested empirically over and repeated many thousands of times. Plants simply do not care where the nutes come from. They use them exactly the same. So for me, this is a no brainer. Use whatever is cheap and available. Human urine, goat and sheep poop, Miracle Grow, blood and bone meal, whatever. Cannabis plans are pigs and will eat whatever you give them. And I can from experience say that plants fed synthetics DO NOT TASTE ANY DIFFERENT than plants fed so called organic plant foods. I do not care how long and loud you scream about it. I have grown THOUSANDS of Cannabis plants in my lifetime, and over 200 different strains/hybrids/varieties. I defy you to tell me that one of my Miracle grow fed buds tastes any different than a horse manure fed plant. It does not come out that way. There is no chemical taste or residue. Plants have natural filters in the root systems to prevent that, as long as you do not overdue things. Give them what they want and they will be happy. You have to know how to read the leaves and growth to tell what they are lacking. That is a key in this. As are when to harvest, how to cure, and how long to cure the buds. That and the genetics in my experience are where the smell, taste and highs/stones are most influenced.
Personally I grow biodynamic (not just for Cannabis, all plants that I grow), and use a wide spectrum of organic, inorganic and synthetic pesticides and plant foods. Why limit my growing to what the USDA and state of Oregon says I can use? Fark them. I do not grow for commercial sales so I do not have to get my results tested or go by anyone's rules. I smoke what I grow. It does not make me sick. And no, I do not use strong pesticides that leave residues or do not break down. Nor do I drown my plants in Miracle Grow. Of late I use a lot of human pee on my weed. Its free, its good, and the plants love it. Why pay for something that most people flush down the john? I use Avid and refined Neem for pest and PM control. They work well. I also use super phosphate and Ironite pellets. Dunno if they are considered organic or not, but I do not really care. At times I may use hydrogen peroxide, agricultural soap/spreaders, sheep poop, human pee, Abamectin, refined Neem oil, Safers soap, Miracle Grow (or equivalent water soluble fertilizer), Alpaca Poo, cow poop, barn muck, horse poop (after a year of setting), variable types of compost, who knows what types of natural fungi I have in the soil here (there are so many I cannot count), blood meal, kelp meal, bone meal, hoof and horn meal, cottonseed meal, Osmocote, oyster shell, or a splattering of other things that come available. I also make my own soils, mainly a mix of local silty loam and ground up leaves from the year before. The worms love the dead leaf material in the soil. I let the worms do my aeration and they leave castings for the plants. I see lots of fungi and worms in my soil when I re-use the Cannabis plant soil for bamboos and tomatoes and other plants. I do not re-use Cannabis soil on Cannabis plants. Too may pests can be harbored that way. Phylloxera is here in Oregon now and has adapted to dine on Cannabis. As have hemp mites, various spider mites and broad mites. All bad for Cannabis. PM is another issue with growing some strains here, but it contolled by 1:100 strength refined 70% neem oil.
Well, I do not post here much these days. But this is and has been an online issue for me regarding weed growing, so chew on that...