Ammi visnaga Lam., the source of khellin is an annual or biennial crop, which can be cultivated in Japan. The content of khellin in the fruit, as determined by the present authors by the modified method of Abd El-Aziz Abd El-Rahman, was 0.1%, but none was detected from undergrown fruits, and primary and secondary rays of compound umbels. It seems to be more profitable and desirable to cultivate this plant as a biennial crop by sowing in autumn, in Japan. The cultivation of this plant is practically possible by means of transplantation, too, which should preferably be made by the end of April at the latest. The autumn sowingshould be done by the middle of October and spring sowing by the beginning of April at the latest. The cultivation of this plant is suited in a rich and well-drained soil, containing a large amount of clay.
