Heirloom Herb. Sweet Marjoram seeds produce leaves that are aromatic, mild, sweet and absolutely delicious in dressings, soups and salads. It is said that this herb is a must when cooking strong meats. The plant is a vigorous grower, often reaching 60 cm (2′) in height. Also known as Pot Marjoram, French Marjoram or Cretan Oregano.