As far as amendment for organic soil, in my Worm bin, basically if it’s biodegradable or organic I’ll toss it in. Example, Shredded cardboard, sawdust, kitchen scraps, plants and or leaves. Tea bags, coffee grinds ect. I also feed the worms specifically a high vegetable & fruit smoothes. Since I’ve been doing this I find all kind of new beneficial microbes life in the soil…
I use this soil for all my plants 🪴 and have had good results so far.