“The fiddlehead’s total antioxidant activity is twice that of blueberries.” – DR. JOHN DELONG Fiddlehead greens, the young, tightly curled fronds of the indigenous wild ostrich fern (Matteucia struthiopteris), are a delectable spring vegetable and rite of the season. Fiddleheads as a food source have been well known to Canada’s First Nations for many years.