Many wild berries are edible, but be sure you can identify them because not all are. Wild strawberries, black berries, raspberries, mulberries, bearberries, cranberries, hack berries and gooseberries are all edible. If the berries grow on a stalk close to the ground in clusters, or if the berries are white, do not eat them, as these are most certainly poisonous.
Cattails are a versatile wild food item. The roots, shoots and flowering heads of the cattail are all edible. They can be fixed in several ways--either sauteed, eaten fresh as a green, or used as a starch-based thickener for soups or stews.
Duckweed looks like green slime on a pond's surface. Though it may not appear appetizing, it is edible. If you look closely, it is a green water cover made up of small plants. Duckweed should be pureed and blended into a soup and thoroughly cooked for best results.
Many wild mushrooms are poisonous, so one must proceed with extreme caution. Morel mushrooms are the most easily identified for their ridge and pit appearance. They grow in the spring, mostly in April and May.
Many wild plants have parts that are edible, but other parts of the same plant may be poisonous. One should proceed with extreme caution when it comes to ingesting wild vegetation. Keep in mind also that many wild plants can be eaten when cooked, but in their raw forms can cause intestinal distress and even death. Never eat a wild plant without it having been identified.