Oregano (Origanum vulgare) is a Mediterranean perennial herb prized for its intensely aromatic leaves, used extensively in Italian, Greek, Mexican, and Middle Eastern cooking. The flavor comes from volatile oils (primarily thymol and carvacrol) that concentrate in the leaves — and these oils become more intense in hot, dry, sunny conditions, which is why oregano grown in Mediterranean-like conditions has far more flavor than grocery store bunches grown in high-moisture environments.
Once established, oregano is remarkably low-maintenance and drought-tolerant, returning reliably each spring as a perennial in Zones 5 and warmer. It spreads gradually, and established plants can become quite large — 18–24 inches wide with woody stems. Unlike basil, oregano actually improves in flavor when the leaves are dried, making it easy to preserve for year-round use.
Oregano's flowers attract a broad range of beneficial insects — bees, hoverflies, and parasitic wasps — when allowed to bloom. As a drought-tolerant perennial, it makes an ideal permanent border plant for Mediterranean herb beds. The planner helps you place perennial herbs in dedicated zones that frame your annual vegetable beds.
Transplant oregano in spring after your last frost date, or start from seed indoors 8–10 weeks before. Oregano is a perennial herb — once planted in Zones 5+, it returns every year without replanting. You can also divide established plants in spring or fall and transplant divisions to new locations. Garden center transplants are the fastest way to establish oregano.
Yes — oregano is a perennial herb that returns reliably each spring in Zones 5 through 10. In Zones 3–4, it's borderline perennial and may die in harsh winters but often survives with protection. In the warmest zones (9–10), oregano can be an evergreen shrub with year-round leaf production. Even in cold zones where tops die back, the roots often survive and resprout.
Mild oregano flavor results from too much shade, overwatering, excessive nitrogen fertilization (promotes leaf growth at the expense of oil production), or growing a low-quality variety. Oregano's flavor intensifies in hot, dry conditions with full sun. Move plants to the sunniest spot, reduce watering, avoid fertilizing, and ensure you're growing a culinary-quality variety (Greek oregano is most flavorful).
Yes — oregano grows on a south-facing windowsill but produces less flavorful leaves than outdoor plants due to reduced light intensity and air circulation. Grow lights positioned 3–4 inches above plants for 16 hours per day significantly improve indoor production. Keep indoor plants slightly dry between waterings — root rot from overwatering is the most common cause of indoor oregano death.
Once established, water oregano sparingly — every 7–14 days in warm weather, less in cool weather. Allow soil to dry completely between waterings. Oregano is highly drought-tolerant and will thrive with minimal water once its roots are established. Overwatering (especially in clay soil or containers without drainage) causes root rot, which is the leading cause of oregano plant failure.