Start the seeds indoors about 2 months before the last spring frost, sowing them just below the surface of the soil and keeping the temperature at 65-70 degrees F. Provide at least six hours of sunlight, and keep the soil moist when the seedlings appear. Transplant them as soon as they grow big enough to handle or after the last chance of frost, spacing them 12-15" apart. Oregano thrives in fairly dry soil and full sun. To direct sow, plant seeds and thin the seedlings to 12-15" apart. As a companion plant, oregano repels the harmful cabbage butterfly. This herb also grows well as a container plant. Oregano actually has the most flavorful taste if left alone, with minimal watering and no fertilization. For the best tasting leaves, keep the tops pruned to prevent flowering and to keep the leaves tender.