TIP: Wild Oregano (Cunila origanoides) is an edible member of the mint family and occurs in the southern woodlands of Illinois. More than one species of wild oregano exist worldwide: Some are more peppery than others. Others can be the most flavorful oregano you ever tasted, especially when harvested fresh in April. Know that some wild plants you encounter in the woodlands of Illinois are quite toxic--just as some wild mushrooms are dangerously toxic. So you’ll want to educate yourself before hitting the woods.