Rue (Ruta Graveolens)- Grown from Rue seeds, this perennial ornamental herb is as versatile as it is lovely. Known as Herb of Grace, Garden Rue and Common Rue, it is a wonderful addition to the herb garden because it is evergreen and can be pruned and shaped into a hedge. It is often used in knot gardens. The base becomes woody but the tips remain herbaceous. By mid-summer, the Rue herb plant has yellow flower clusters covering most of the plant.