Well preserved has a nice article on edible blue violets. This is good one because it is that time of year when they are blooming in most areas of the country. So if you like to forage or would like to try it, find some pesticide free violets and add them to a salad or sugar the blossoms to decorate baked goods.
http://wellpreserved.ca/learning-to-forage-blue-violet/
The Forager’s Harvest: A Guide to Identifying, Harvesting, and Preparing Edible Wild Plants
