Garlic is usually planted in autumn and has grown into small garlic seedlings in winter. After the warm spring, garlic seedlings grow rapidly. When the sunshine is gradually lengthened, several buds are produced around the garlic moss. When the garlic shoots bolting, each bud expands rapidly and grows together, thus forming one garlic clove after another.

1, sowing too late is the main reason for the emergence of single garlic. If planted in warm spring, garlic seedlings will encounter high temperature and long sunshine soon after growth. This condition is not conducive to the development of garlic shoots, many garlic shoots will degenerate, leaving only single garlic, thus forming single garlic.

2. Garlic grows inflorescences that don't bloom, but produces many aerial bulbs (that is, the flowers at the top of garlic bolts grow up). When planted in the ground, garlic produced in this way is usually single clove garlic.

3. In addition, early-maturing varieties, small garlic petals, poor soil, insufficient base fertilizer, drought and water shortage, serious grass shortage, excessive density, too few leaves, and unsatisfactory temperature and light conditions for scale bud differentiation will all lead to a garlic head.

4. Due to species degradation, the plants grow weakly, the leaf area is small, and the assimilated nutrients accumulate less, so the plants are not enough to differentiate flower buds.