Garlic grows regularly and can only germinate after a certain period of dormancy after harvest. In addition, garlic needs to be treated at low temperature (i.e. vernalization stage) before it can bolt and form bulbs normally. This is why garlic is usually planted in the first autumn and harvested in the second summer. Of course, in some places in the north, such as Baodi District in Tianjin, kind of garlic was planted in early spring, but it was only in the ninth year (89 or 99). This is also to spring garlic at low temperature in a certain period of time to ensure garlic bolting and fruiting. In some places, in order to harvest a head of garlic, the planting time of garlic is specially postponed.
If garlic is planted in summer, garlic seeds will not germinate, grow and bear fruit normally because they are harvested in the same year and sown directly shortly after harvest. There are two main reasons: 1 and insufficient dormancy of new garlic varieties. 2. The high temperature in summer can't make garlic spring. If it is cultivated at this time, it must be treated at a low temperature (garlic seeds are treated at a low temperature of 5- 10℃ for 7- 10 days). Before planting, the garlic seeds are soaked in water for 3-5 hours to make the garlic seeds swell, and then they are planted in the shade to make the garlic sprout and grow.