Why do flowers and plants sprout and bloom in spring and bear leaves in autumn every year?

Except oxygen and nutrients, germination is mainly related to temperature and moisture, and flowering and fruiting are mainly related to photoperiod and temperature.

Under natural conditions, spring is humid, and continuous warm weather and temperature are very suitable for germination. If proper humidity and temperature are artificially made, seeds can germinate, such as bean sprouts, which are common all year round and can also be made at home.

The length of photoperiod is very important to plant flowering stimulation. Some flowers bloom in spring and summer, because they are flowering plants with long photoperiod and are stimulated by longer and longer sunshine time in spring and summer; Some flowers are in autumn or winter, because they are short-lived flowering plants, and the daytime light time in autumn and winter is getting shorter and shorter. Artificial change of photoperiod can also change the flowering and fruiting time of plants (shading or supplementing light), and anti-season flowering and fruiting are realized by creating and changing conditions.