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In the Garden
Rue (Ruta graveolens), an evergreen perennial, is a traditional plant in the herb garden or in flower beds and containers. Its distinctly blue leaves create a lovely contrast against green- and silver-leaved herbs growing with it. In its second season, rue will reach 2 to 3 feet tall, producing pale yellow flowers that are a nice complement to its foliage. Herb garden enthusiasts grow it for historical interest because of its history of medicinal uses dating back to Roman times.
Planting and Care
Rue is a hardy evergreen in zones 4 through 9. Choose a location in full sun and well-drained soil, allowing about 18 inches of bed to accommodate the width of the plant. Plants prefer a slightly alkaline soil, so add lime if needed; pH should be 7. Cut back the tall stalks after the flowers fade to encourage fresh, leafy growth.
Troubleshooting
Be sure that drainage is good and plants have good air circulation in humid climates to avoid problems with rot and fungus.
While it is rare, some people experience dermatitis in response to handling rue. Also, sunburn has been reported on skin that has been exposed to plant oils.
Fresh Uses
The clustered greenish-yellow flowers serve as filler in flower arrangements large and small. In fact, rue should be considered a worthy addition to a flower border or cut flower garden.