Original: Ancient Persians cultivated Persian saffron (Crocus sativus 'Hausknechtii') in Derbena, Isfahan, and Khorasan  by the 10th century BC.
Simplified: Ancient Persians were growing their own type of saffron (Crocus sativus 'Hausknechtii') in Derbena, Isfahan, and Khorasan  by the 10th century BC.