Morel season? What's the daily bag limit?

What's the deal with these morels? Are they that good? I've never heard of them until I got on this forum. Do they grow exclusively up north? I love mushrooms, but I've never eaten a morel. Do they grow down south? I know we have a bunch of mushrooms down here but I'm not going to eat them. I am likely to pick the wrong kind and kill myself.