There is much confusion concerning the difference between oregano and marjoram. To many, oregano is more of a flavor than any one individual plant. However, if you want to “true” oregano, Greek oregano is the one to plant. It grows to 20 inches, with purple flowers and spade-shaped, olive-green leaves. Most frequently used with roasted, fried or grilled vegetables, meat and fish. Oregano also combines well with spicy foods.