Yes, in my experience, it is very helpful. I had this small mention about it in an article I did awhile ago. I think there may be additional information on Dave's thread about vermicomposting but I'm not sure. I buy dried worm castings at our Farmers' Market and make it from those.
http://garden.org/ideas/view/S...
There may be a discussion about it elsewhere but I can't locate one.
