Host plant to Swallowtail butterflies! An evergreen (in the South) cold-hardy perennial herb with fragrant lacy bluish-green foliage bearing small yellow flowers in summer. It is heat and drought tolerant and suitable for dry, sunny areas. Rue will grow 1-3 feet at maturity and is ideal for short hedges or borders. Rue will deter cats and is a natural insect repellant. Good companion plant for Raspberries, Roses, Alpine Strawberries, and Fig.