One of the websites that is great for explaining which wild plants are safe to eat, as well as how and when to eat them, is Green Dean's Eat the Weeds website and youtube videos. Although I like the idea of foraging for natural wild plants , I don't have as much of an opportunity for doing that here in town as when we lived out in the country. We do have lots of wild violets in the spring, and both the leaves and the blossoms are edible. I have used them in salads, and even sauteed the leaves and added them to scrambled eggs. One very healthy survival food is pine needles. I think that most of the evergreen needles are fine to use, so either fir or spruce might work as well as pine needles. I have made pine needle tea, which is supposed to have more vitamin C than a whole lemon has. I also made some pine needle vinegar, which smelled and tasted almost like balsamic vinegar. I just gathered and washed some fresh pine needles, cut them into short pieces with my scissors, and then put them in a glass jar and added the vinegar. I have read that it is even better flavored if you add just a tiny bit of coconut sugar (brown sugar would probably work about the same way), so next time I make some, I will add that as well. I used it to make viniagrette salad dressing, and it gave the dressing an interesting taste and fragrance.