actually...
Few folks know the blossoms of the Magnolia grandiflora are edible, however their flavor is intense and they taste similar to how they smell. They are not eaten raw per se. They are pickled. Oddly the practice started in England and you only use the petals, not the entire blossom. What works best is to pickle the petals in a sweet/sour pickle recipe. Then take out one petal, dice it, and use it sparingly as a flavoring in salads. The flavor is strong so go easy. Also, M. grandiflora‘s leaf can be used just as Magnolia virginiana‘s can as a bay leaf, that is to flavor soups and the like. However, don’t use the entire leaf because it is way too big. Cut it into smaller pieces when used like a bay leaf.
http://www.eattheweeds.com/edible-flowers-part-six/