Seasonal accumulation of major alkaloids in organs of pharmaceutical crop Narcissus Carlton

► Major alkaloid levels were measured in organs of cultivated Narcissus cv. Carlton. ► NMR allowed simultaneous quantitation of narciclasine and other alkaloids. ► Maximum alkaloid concentrations occurred in the bulbs and leaves before flowering. ► Narcissus cv. Carlton can be a source of major alkaloids besides galanthamine.