what kind of soil it is is actually pretty darned important .. you typically want finer grains, sphagnum moss is good.. fox farms soils are good. then you mix that with pearlite. the wood that I can see in your photo should not be there at all. they don't really support micro life.. which is where a soil grow gets most of its nutrients once the plant has pulled what it can from its surroundings. the little microbes keep breaking down the organic material into nutrients useable by the plant. you can probably grow in that, but it will be more like hydroponics, where you have to feed them with a nutrient mix, and its possible the wood will soak up salts, and eventually poison your plant..