Explanation:

Saffron is a spice derived from the flower of Crocus sativus, commonly known as the "saffron crocus". The vivid crimson stigmata and styles, called threads, are collected and dried to be used mainly as a seasoning and colouring agent in food. Saffron has long been the world's most costly spice by weight.  Although some doubts remain on its origin, it is believed that saffron originated in Iran. However, Greece and Mesopotamia have also been suggested as the possible region of origin of this plant. C. sativus is possibly a triploid form of Crocus cartwrightianus. Saffron crocus slowly propagated throughout much of Eurasia and was later brought to parts of North Africa, North America, and Oceania.