I kinda-sorta second Dougwalkabout. Mainly, I know diddly about plants. Why? Well, I grew up in Southern California, which is classified as a "semi-arid desert." Most of the plants we have in the area, once outside the megapolis, are scrub oak, or dry grass (the kind that goes up in massive wildfires each year). Not exactly too tough to learn them, or that they're not super edible.

In that situation, the "fruits and veggy" part of my diet was going to be pre-processed in the way of a dead animal.

Now that I'm in Michigan, I'm getting a bit better. I know what a cattail is (though not really how to prepare one), kind of learning different trees, and want to learn plants. Problem is getting someone knowledgable enough to teach, or the free time to grab a book and hit the trail for a weekend. Again, my plan is lots of fish should I need to bail out.

Useless plants: anything with the word "stinging" or "poisonous" in it's name.