Marjoram (Origanum majorana, Lamiaceae) is a somewhat cold-sensitive perennial herb or undershrub with sweet pine and citrus flavours. It is also called Sweet Marjoram or Knotted Marjoram and Majorana hortensis.
Marjoram is cultivated for its aromatic leaves, either green or dry, for culinary purposes; the tops are cut as the plants begin to flower and are dried slowly in the shade. It is often used in herb combinations such as Herbes de Provence and Za'atar.
Although considered cold-sensitive, marjoram can sometimes prove hardy even in zone 5.
Pot Marjoram or Cretan Oregano (Origanum onites) has similar uses to marjoram.
Hardy Marjoram or French marjoram is a cross of marjoram with oregano that is much more resistant to cold, but is slightly less sweet.
Origanum pulchellum, Showy Marjoram or Showy Oregano.