The best worms are the European Nightcrawlers, that's what I raise. Start a bed with 50 % water saturated peat moss and 50 % cow manure. Feed the worms Purina worm chow (yes, there is such a thing) found at feed stores. They can order it for you. They have survived temps outside from 30 °F to 100+ °F. Here's a link where I got mine:
http://www.hallswormery.com/
- Randy