Things that have failed:
Broccoli
Watermelon
Carrots
Cauliflower
Are all a pain in the ass and IMO not worth the effort. Carrots were the worst. The nightmare creatures that came out of our last garden looked like demon spawn. Gives me shivers thinking about it.
Tomatoes, onions, beans, peas, peppers, potatoes, and Brussels sprouts all rocked. Onions were by far my favorite. We replanted them over and again we went through so many.