(1) Select varieties, sow by stages, control appropriate temperature and supplement light. It is used to adjust the flowering period of gladiolus, which can basically bloom all year round. Canna should choose short early-flowering seeds, which will germinate in hotbeds in the middle and late of 165438+ 10, and then be planted in the open field in the next spring, which can advance the flowering to early May. If late-flowering seeds are selected, they can be germinated in the cold bed in early and middle March, and planted in the open field after the end of late frost, and the flowering period can be delayed to 10. Dahlia can also bloom in stages by choosing suitable varieties.

(2) Control the temperature during bud pregnancy. By controlling the temperature, the flowering of bulbous flowers with pregnant buds can be advanced or delayed, and the flowering period of flowering plants can also be prolonged. Narcissus, tulip, lily and other bulbous flowers can adjust their flowering period in this way.

(3) Breaking the dormant period of bulbs. Bulbs have dormancy period, and bulbs planted in spring hibernate in winter; Bulbs in autumn are dormant in summer, so the germination of bulbs needs to go through a stage of ending or breaking the dormant period. Breaking dormancy usually adopts low temperature or high temperature treatment, and hormone treatment can also be used.

(4) Prolonging the dormancy period of bulbs. Generally, the dormancy period of storage organs can be prolonged by means of low temperature, drying and hormone application, thus delaying their flowering.