Greek oregano (*Origanum vulgare* subsp. *hirtum*) is a perennial herb native to the Mediterranean region. It is prized for its robust flavor and aromatic leaves, commonly used in culinary dishes. While it thrives outdoors in warm, sunny climates, it can also be grown indoors with proper care. Understanding its growth requirements is key to success.
Greek oregano is a sun-loving plant that requires at least 6–8 hours of direct sunlight daily to thrive. Indoors, place it near a south-facing window where it can receive ample light. If natural light is insufficient, supplement with grow lights (LED or fluorescent) positioned 6–12 inches above the plant for 12–14 hours a day. Without adequate light, the plant may become leggy and produce fewer aromatic oils.
Well-draining soil is critical for Greek oregano, as it is prone to root rot in soggy conditions. Use a cactus or succulent potting mix blended with perlite or coarse sand to improve drainage. Choose a pot with drainage holes and avoid containers that are too large, as excess soil retains moisture. Terra cotta pots are ideal because they allow the soil to dry out more evenly.
Greek oregano prefers moderate watering, allowing the top inch of soil to dry out between waterings. Overwatering can lead to fungal diseases, while underwatering may cause wilting. Indoor environments often have lower humidity, but oregano adapts well to average household levels. Avoid misting the leaves, as this can promote mildew. Instead, place a tray of water near the plant to slightly increase humidity if needed.
This herb thrives in temperatures between 65–75°F (18–24°C) during the day and slightly cooler at night. Avoid placing it near drafts, heaters, or air conditioners, as sudden temperature fluctuations can stress the plant. Good air circulation helps prevent pests and diseases, so ensure the plant isn’t crowded and consider using a small fan on low setting if needed.
Greek oregano is a light feeder. Fertilize sparingly with a balanced, water-soluble fertilizer diluted to half strength every 4–6 weeks during the growing season (spring to early fall). Avoid over-fertilizing, as this can reduce flavor intensity. Regular pruning encourages bushier growth. Pinch back the tips or harvest leaves frequently, but avoid removing more than one-third of the plant at a time.
Indoor Greek oregano may attract pests like spider mites, aphids, or whiteflies. Inspect the plant regularly and treat infestations with insecticidal soap or neem oil. Prevent fungal issues by avoiding wet foliage and ensuring proper airflow. Yellowing leaves often indicate overwatering or poor drainage, while brown, crispy edges may signal underwatering or low humidity.
Harvest leaves as needed once the plant reaches 4–6 inches in height. For the best flavor, pick leaves in the morning when essential oils are most concentrated. Greek oregano can live for several years indoors but may become woody over time. To rejuvenate, take cuttings to propagate new plants or divide the root ball every 2–3 years.
