Night crawlers don't like our yellow clay soil. Never seen one here and the ones I introduced in the fill in my wifes flower gardens disappeared. Ordinary garden worms do okay though. I used to raise pygmy goats and around the feeders where they spilled feed, you could dig and every shovel full had thousands of worms about the size of red wigglers but they were yellow and red. Lousy for bait because they were so fragile you couldn't put them on a hook without them falling apart.