Vegetation god

A vegetation deity is a nature deity whose disappearance and reappearance, or life, death and rebirth, embodies the growth cycle of plants. In nature worship, the deity can be a god or goddess with the ability to regenerate itself. A vegetation deity is often a fertility deity. The deity typically undergoes dismemberment (see sparagmos), scattering, and reintegration, as narrated in a myth or reenacted by a religious ritual. The cyclical pattern is given theological significance on themes such as immortality, resurrection, and reincarnation. Vegetation myths have structural resemblances to certain creation myths in which parts of a being's body generate aspects of the cosmos, such as the Norse myth of Ymir.

In mythography of the 19th and early 20th century, as for example in The Golden Bough of J.G. Frazer, the figure is related to the "corn spirit," "corn" in this sense meaning grain in general. That triviality is giving the concept its tendency to turn into a meaningless generality, as Walter Friedrich Otto remarked of trying to use a "name as futile and yet pretentious as 'Vegetation deity'."

In the Mesopotamian tradition, during the journey of Inanna or Ishtar to the underworld, the earth becomes sterile, and neither humans nor animals are able to procreate. After confronting Ereshkigal, her sister and ruler of the underworld, Inanna is killed, but an emissary from the gods administers potions to restore her to life. She is allowed to return to the upper world only if someone else will take her place. Her husband, the vegetation god Dumuzi, agrees to spend half the year in the underworld, during which time vegetation dies off. His return bring regrowth.

...
Wikipedia