One crop that you should grow with caution, (besides marijuana) is zucchini. I have tried growing zucchini, and at first it was great. Perfect little tender veggies about four to six inches long that tasted great. The problem was that they grew fast and if you didn't pay attention for a couple of days, you came back to huge zucchinis that looked like they were on steroids and might even contain alien beings.
Here at our house in Florida, Mark has been growing tomatoes this year, and even though I have made fun of his gardening skills, and called his garden the Auschwitz for plants, I have to admit he's done a pretty good job. We have been eating his tomatoes for the last two weeks, and unlike the crappy hard ones you get at the supermarket, these are very flavorful and tender. And of course Mark's tomatoes are salmonella free.