Interesting that they say 'earthworm' castings since earthworms typically are a deeper living worm, don't breed as fast and don't make as many castings so aren't as commercially viable.
Most commercial operations that I'm aware of use either pure red worms (red wigglers that are a composting worm and surface dweller) or a combination of them plus something like a European night crawler which is a deeper living worm in beds that are deeper.
Maybe it's just a mislabeled marketing thing calling them earthworms but the castings are all probably about the same.
Most commercial operations that I'm aware of use either pure red worms (red wigglers that are a composting worm and surface dweller) or a combination of them plus something like a European night crawler which is a deeper living worm in beds that are deeper.
Maybe it's just a mislabeled marketing thing calling them earthworms but the castings are all probably about the same.