Hi Rrog,
Say couldn't one effectively obtain EWC using a hole in their back yard. I understand red wriggler is the best and I am willing to introduce them if there aren't that many native ones around. But here is my question by back yard, why would I need to build an bin above ground and try to keep it right temp environment. Should I not be able to somehow use the ground as my bin as a free range bin for my worms. My thinking is if the area in the ground is designated as a composting bin but with free access to all the critters in the soil, couldn't one maintain a hospitable natural bin using the ground some sort of tray collection buried a foot or two down with maybe a hand pump to pump casting fluid. Just trying to think how I can produce my own EWC using resources readily available and to ensure right enviroment why not build a bin what utilizes the ground which worms already live in...?