I'd have to agree with @NaturalTherapy. But there are plenty really good brands. People knock wiggle worm which I believe would be most available to. everyone. I've used them and they do just fine. The people who make vermifire soil make a great casting and aurora the roots organic people have a good casting as well. I'd check out any local nursery and they should carry a local farms castings. I wouldn't worry too much aboit which brand u use just that u have them.