The growth process of pea is divided into seedling stage, branching stage, bud-bearing stage, flowering and pod-bearing stage and filling maturity stage.

1, seedling stage.

Seed germ breaks through the seed coat and is exposed about 2 cm above the soil surface, which is called emergence. It usually takes 7 ~ 21day from seed germination to emergence. Peas cotyledons are not unearthed.

2. Branching period.

Generally, in the stage of 3 ~ 5 true leaves, the branch begins to occur from the basal node, and grows to 2 cm long. When there are 2 ~ 3 unfolded leaves, it is considered as a branch.

3, pregnant bud period.

Entering bud stage is characterized by bud differentiation at the top of main stem. Bud-pregnant period is the period when peas grow fastest and dry matter forms and accumulates more.

4. Flowering and pod setting period.

Pea blooms and bears pods at the same time. It is the peak period of pea growth and development from the beginning to the end, which generally lasts for 30 ~ 45 days.

5. Grouting maturity.

After the flower of pea withered, the elongation speed of young pods accelerated, and the pod reached the maximum length about 14 days after the flower withered. At the same time of pod elongation, filling makes the seeds swell gradually.

Peas spread seeds in the following ways:

1, natural propagation, peas can be propagated by natural propagation. Mature pea pods usually cracks and releases seeds. These seeds fall into the soil and then are dispersed to the surrounding areas by natural forces such as gravity, water flow and wind. This way of natural transmission helps to spread peas to ensure that they grow on different lands.

2. Artificial planting. Most peas are propagated by artificial planting. During the planting season, farmers will sow pea seeds in the prepared soil. These seeds are usually arranged at certain intervals and then covered with soil. In the process of artificial planting, the growth conditions of peas can be effectively controlled, including soil quality, moisture, temperature and light.

3. Save seeds. Farmers usually save some pea seeds for planting in the next season. These seeds need to be stored in a dry and well-ventilated place to ensure that they are not damaged during storage. Proper preservation methods can maintain the germination ability of seeds so as to continue planting in the next season.

4. Artificial pollination can be used to increase the quality and quantity of peas. This is a method of transferring pollen from one flower to another to promote fertilization and seed formation. This method is often used to improve pea varieties or research to ensure the genetic characteristics of seeds.