How to Grow Italian Large Leaf Oregano

Soil, care & harvest

Prepare well-draining soil with a pH between 6.0 and 8.0 before planting. Since this is a frost-sensitive warm-season crop, sow seeds outdoors only after the last spring frost when the ground has warmed up. Alternatively, start indoors several weeks prior to your local frost date if you wish to get a head start. Press seeds lightly into the soil surface, as they do not require deep burial. Expect germination within 7 to 14 days.

Space plants 8 to 12 inches apart to ensure good air circulation and healthy growth. While support is rarely needed for this herb, regular watering during dry spells helps maintain flavor, though it tolerates low moisture well. Apply a light mulch to retain soil moisture and suppress weeds. Feed sparingly with balanced fertilizer if the plant shows signs of nutrient deficiency or heavy pruning.

Watch for spider mites, aphids, and leafminers; treat infestations by spraying water or using insecticidal soap. Prevent root rot, mint rust, and powdery mildew by ensuring proper drainage and avoiding overhead watering in humid weather. Harvest leaves once the plant reaches maturity, typically around 74 days after sowing, picking stems just before flowering for the best flavor.