Hi there Azimuth! Also thank you to
@Amy Gardner for the nudge! Glad to meet ya! You are asking about LOS, living organic soil. This soil is meant to be self sustaining, the container of soil itself can be considered a living sustaining biosphere, that only needs water and a few top dressings to recharge things that begin to wear out. I have heard it said that it takes at least 15 gallons of soil to do that. LOS will not work in 1 gallon containers.
I used a method called TLO, which stands for True Living Organics, and it was sort of a crossbreed of the organic world that allowed for a true organic feeding cycle, without having to maintain a living soil environment. The trick was to use SUPERSOIL, a special blend of highly enriched soil in the bottom of the containers and then brew up specialized actively aerated compost teas, different ones for each stage of the grow. To do it right it takes hundreds of dollars of set up to get all the raw materials together, air pumps and containers, not to mention the soil... and then you have to learn how to brew the teas and put up with the mess and the smell. Organics can be messy. Also, the TLO method recommended 2gal containers or larger.
My current organic method of choice is
@GeoFlora Nutrients , one of our
sponsors. It requires a once every two week application of either the bloom or veg nutrient mix, right on the top of the soil as you water it in. It comes in strong with all the raw nutrients and the exact microbes needed to process them, in such huge numbers it even laughs off unprocessed tap water. It is amazing stuff and super easy to use, and would probably work in your tiny space and still give you an organic grow. Good luck!