The condition for the pea pods to explode is that the peas in the pods expand larger than the shells when heated, so they naturally explode. The main reason is the gradual splitting of molecules at the dry interface of the bean skin, and the auxiliary reason is the thermal expansion and contraction of the internal air and beans.

Beans must be harvested in time after they mature, otherwise the pods will explode and the beans will fall to the ground, causing losses. In addition, the time to harvest beans should be in the morning, when they are harvested with dew, so that the pods will not explode.

The formation process of pea pods

The pods develop from single carpels and pistils. During the development process, a ventral suture is formed along the carpel healing point and opposite to the ventral suture. Dorsal suture, some pods will crack along the ventral and dorsal sutures after maturity and split into two pieces when mature, and the seeds will collapse. The pods usually contain multiple seeds that are borne along the ventral suture.

Occasionally, there are pods with only one seed, such as Sophora acacia and Water yellow bark. The peels of bean pods are diverse. Some species have a smooth surface like peas, some species have a hairy surface like soybeans, and some have fleshy skins like sophora pods. The sepals of the pods are present and attached to one side of the fruit pedicle.