If you live near a river/stream/creek you can do even better than the nitro-injected crawlers. In and around some banks you can find a true green worm. They are naturally green and stink. I guess that is why fish seem to love them. I've tried both the "nitro worms" and the green worms and there is a big difference in productivity. The true green worms are the size and shape of a redworm but I've caught plenty of decent sized fish on them including some really nice cats.