I have had great results growing autos in organics. I resuse all my soils, and compost my trim. I have zero waste. I recomend a good soil mix for autos just about 9 out of 10 times. Even a good mix with coco as a base is kick ass.
If you have a good soil mix that has been cooking(sitting there) for a few days you are going to have nutes avail to the plant. I only water with teas and add very little in terms of extras. Only the bloom boosters. Everyone has their preference, mine is to have clean smoke that synthetics haven't even tuched. There are also slow release organic ferts and fast ones..
Hydro is hard to impossible to do fully organic, so in that instance i wouldn't recommend it.
I grow autos all the time, and i use organics. Every plant i post pics of is organically grown is soil. I started with PromixHP, i didn't like the BX. I am moving to coco as the need for lime is diminished. I have had BAD things happen with MG organic soils.. I don't often recomend it, you see people have good results. I just don't think they are very consistent in terms of quality.
FoxFarms works with autos very well. I haven't used it as i do my own mixes. However you can't argue with the results seen with their products.
Just giving some first hand auto advice.
Edit: The worm poo is bringing is micro life and different elements not found in regular bagged soil. I wouldn't call it a complete nutrient though. You'll need other addatives. Welcome Harvest Farms has a great line of addatives that i use in building my soil.
I also didn't know omri was so lax in terms of who they list. I liked the idea because some one else has allready looked at the ingedients for me. I will in the future be looking more cloesly.
Thought i'd also add i use Hornbys big bud for a flower addative, i have also used shooting powder.
Edit 2, in my last post i had talked about my own soil mix. I will post it here since i am assuming you don't want to dig for it.
I will break it down for a 2 gal grow bag. Since that is what i use more often than not. There are 3.7 liters per 1 Gal, for anyone who is on a different measurement.
-1 gal grow medium (Peat/coco/Home Compost)
-2 cups sheep mauer (Or 2 cups "welcome harvest grow" not a poo product) For N heavy autos i'll put in 3 cups per grow bag, i have gone higher in some mixes. I use sheep because i have access to it, do some reading on what mauer if at all you decide to use. As some will need more time to sit and compost, as they are hot from the bag.
-3 cups kelp. I use the dry mix that "Welcome Harvest Farms" sells. For soil mixes
-2 Tbs Dolomitic lime.
-3 cups Blood/Bone meal. You can get it just about anyware.
-Add a splash of perlite to lighten the mix up, say 3 to 4 cups? Nothing says you cannot add more/less. If your base medium has it allready you may not need much
- 3 cups of welcome harvest "Flower Power" you can substitute some bat guanos for flower nutes as well.
-Fill the rest with Worm Castings.
There are plenty of other things you can add, and i do when they are around to use. I try to get as many different micro nutes for the soil life to feed on as i can. Rock phosphates are good, green sand is also VERY good.
Since autos flower so soon, you will want a flower "heavy" amended soil mix. With only enough N for 5 weeks growth from seed.
In the end you budget will determin what you do, a water fed nute will be less hassle than all these admendments. This mix should not be used on seedlings, you will get a very high male ratio. Seedlings in regular promix until sexed then transplant into your mix.
Bh.