Urtica dioica 3-6' tall. Young shoots are high in minerals and leaves are delicious steamed as early spring greens. Cooking removes the sting. Spreads readily; choose your site carefully. Z2.
Origanum vulgare 18-20" tall. Fragrant green and purple leaves used for culinary purposes. Given plenty space in full sun, it sprawls and is attractive to pollinators. Z4.
Viola sororia 6-10" tall. North American native with cheery blue-purple flowers and attractive heart-shaped leaves, all edible. Larval host plant for multiple species of butterflies. Z3.
Thymus vulgaris 10-15" tall. Fragrant sprawling perennial brings depth of flavor to soups, gravies, casseroles. Said to calm the nerves, soothe headaches. Bees love it! Z4.