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Oregano (Italian) is the backbone herb of Mediterranean cooking — a pungent, aromatic perennial with small, oval, greyish-green leaves whose concentrated essential oils deliver the warm, slightly peppery, intensely herbaceous flavor that defines pizza sauce, pasta marinara, Greek salads, and most Italian-American red sauce dishes. Italian oregano (Origanum vulgare) is the most cold-hardy and widely adapted species, distinct from the more tender and more intensely flavored Greek oregano (O. vulgare subsp. hirtum) — though both are excellent kitchen herbs. Unlike many fresh herbs, oregano's flavor actually concentrates and improves when dried, making homegrown dried oregano of dramatically superior quality to commercially dried oregano that may have been harvested years earlier. The plants are drought-tolerant perennials in zones 5–10, requiring almost no care once established.
Plant Italian oregano in full sun (6+ hours daily) with very well-drained soil — this herb is native to rocky, poor Mediterranean hillsides and actively dislikes the rich, moist soils that most vegetables prefer. In clay soils, amend with coarse sand or gravel and raise the planting area. Space plants 12–15 inches apart. Once established, Italian oregano is drought-tolerant and cold-hardy (to about -10°F/-23°C with good drainage and snow cover). Water sparingly after the first season — overwatering is the primary cause of oregano decline. Feed once in early spring with a balanced fertilizer; additional feeding reduces flavor concentration. Harvest by cutting stems back by one-third to one-half, which encourages bushy regrowth and prevents the woodiness that develops in uncut plants. The flavor is most intense just before the plant flowers — harvest heavily at this stage for the best dried product. For drying: cut stems in the morning, bundle loosely with a rubber band, and hang upside down in a warm, well-ventilated, dark location. Fully dried leaves strip easily from stems and store well in airtight glass containers for 1–2 years. Prune hard (to 3–4 inches) after the first fall frost in cold climates to prevent disease in the crown over winter.
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