After the shelf life, its quality and efficacy will be greatly reduced, and with the passage of time, some tiny microorganisms will also breed, which is harmful to health, so expired food should be discarded.

Crocus sativus, formerly known as crocus sativus, originated in Spain, Greece, Asia Minor, Persia and other places. Compendium of Materia Medica records: "Crocus sativus, translated as Bovran or Crocus sativus, is produced in Arab countries." "Kingdom of Arabia" refers to countries such as Persia. Saffron was introduced into Tibet through India, and then into China. Therefore, people mistakenly think that the saffron transported from Tibet to the mainland is produced in Tibet and call it "saffron".

Perennial herbs. Underground bulbs are spherical and covered with brown membranous scales. 9 ~ 15 leaves, white bulbs, sessile, long and narrow, linear, 15 ~ 20 cm long and 2 ~ 3 cm wide, with fine hairs at the edge and 4 ~ 5 wide scales at the base. Flowers terminal, 2.5 ~ 3 cm in diameter; Perianth 6 pieces, obovate, lavender, tube length 4 ~ 6 cm, thin tube; 3 stamens, large anthers and arrow-shaped base; Pistil 3, carpels connate, ovary inferior, style slender, yellow, trifoliate at the top, hanging outside the tube, crimson, slightly enlarged at the top of stigma, with funnel-shaped opening. Capsule, long, with three blunt edges, about 3 cm long and 65438 0.5 cm wide, reaches the ground when the fruit is ripe. Seeds are numerous, spherical and leathery. Flowering:165438+1early to mid-October.

Saffron is a well-known "Tibetan medicine" at home and abroad. Its medicinal effects are peculiar, especially for promoting blood circulation and nourishing blood. According to Compendium of Materia Medica, crocus sativus can "promote blood circulation, control depression and treat fright". Crocus sativus has the functions of dredging meridian passage, removing blood stasis, removing blood stasis and swelling, cooling blood and detoxicating, relieving depression and calming the nerves. Taking it for a long time can make people feel happy and improve human immunity in an all-round way. Modern pharmacological research has proved that it is effective in improving myocardial blood supply and oxygen supply. Crocus sativus contains many glycosides, which can obviously increase the blood flow of coronary artery.