Original: Approximately 150 flowers yield  of dry saffron threads; to produce 12 g of dried saffron (72 g freshly harvested), 1 kg of flowers are needed (1 lb for 0.2 oz of dried saffron).
Simplified: From 150 flowers, the farmer can get about 1 g of dry saffron threads. To produce 12 g of dried saffron (72 g freshly harvested) would take about 1 kg of flowers (1 lb for 0.2 oz of dried saffron).