About Origanum vulgare L.
Oregano, scientifically known as Origanum vulgare L., is a perennial herb that is related to marjoram, and is sometimes called wild marjorare. In colder climates, it is usually grown as an annual because it often cannot survive winter conditions. It reaches 90 centimeters (35 inches) in height and spreads 50 centimeters (20 inches) wide. It has spade-shaped, olive-green leaves. Its flowers, which come in purple, pink or white, measure 4–7 cm (1+1⁄2–2+3⁄4 in) long and grow in clustered groups.
For cultivation, oregano is planted in early spring, with individual plants spaced 30 cm (12 in) apart. It grows best in fairly dry soil with exposure to full sun. It can tolerate a soil pH range from 6.0 (mildly acidic) to 9.0 (strongly alkaline), and prefers a pH between 6.0 and 8.0. It favors a hot, relatively dry climate, but can also grow well in many other environments.
