Rue plants have bluish-green, fernlike leaves that are bushy and compact. The flowers on the rue herb are yellow with petals that are frilly on the edges and the center of the flower is normally green. Rue normally grows to a height of 2 to 3 feet tall. Culture: Rue grows best in cool and warm climates, but it doesn’t like humidity during summer. Rue likes poor soil but it must be well drained and deep. Sandy or gravelled soils are the best choices. A deep watering every two weeks is best from mid-autumn to mid-spring. During summer, water only if it gets very dry; let rain do most of the watering. Uses: The seeds are a popular spice, especially in central Europe. They enhance pork, goulash, sauerkraut, cheese, pickles, and are added to cooking cabbage to reduce the smell. They flavor breads and cakes. Chopped leaves are added to soups and salads, and the root is cooked as a vegetable.