Providing the bulb is greater than 12 cm, in circumference, hardy Narcissus begin to form their flowers about one month after the plants flower in the spring. They reproduce by offsets. The leaves and budded flowers will tolerate a frost. However, open flowers are readily damaged by frost. The flowers form during the warm summer months.
Bulbs reproduce by offsets.
Hardy I and II Types . They must be planted in fall as indicated below.