Cults and attributes
Hyacinthus had a shrine in Amyclea, which he came to share with Apollo. Various scholars agree that Hyacinthus was a pre-Hellenic nature god, and certain aspects of his own cult suggest that he was a chthonic vegetation deity whose cults were merged with Apollo's. Nilsson says that Hyacinthus is a Cretan word, and its pre-Hellenic origin is indicated by the suffix -nth. Hyacinthus personifies the sprouting vegetation in spring, which is killed by the heat of the summer. The apotheosis of Hyacinthus indicates that, after attaining godhood, he represented the natural cycle of decay and renewal.
The fact that at Tarentum a Hyacinthus tomb is ascribed by Polybius to Apollo Hyacinthus (not Hyacinthus) has led some to think that the personalities are one, and that the hero is merely an emanation from the god; confirmation is sought in the Apolline appellation τετράχειρ, alleged by Hesychius to have been used in Laconia, and assumed to describe a composite figure of Apollo-Hyacinthus. Against this theory is the essential difference between the two figures. Hyacinthus is a chthonian vegetation god whose worshippers are afflicted and sorrowful; though interested in vegetation, Apollo's death is not celebrated in any ritual, his worship is joyous and triumphant, and finally, the Amyclean Apollo is specifically the god of war and song. Moreover, Pausanias describes the monument at Amyclae as consisting of a rude figure of Apollo standing on an altar-shaped base that formed the tomb of Hyacinthus. Into the latter offerings were put for the hero before gifts were made to the god.
Hyacinthus was gifted a swan chariot by Apollo and appeared in ancient arts riding it, either to meet Apollo or to escape the advances of Zephyrus. Swans were believed to be the birds of Hyperborea, a mystical land of eternal spring and immortality, to which Apollo himself traveled every winter on a chariot drawn by swans. This association of Hyacinth with swans places him in close connection to Hyperborean Apollo and spring. It is suggested that Hyacinthus would have spent the winter months in the underworld, or more suitably Hyperborea and returning to earth in the spring when the hyacinth flower blooms.
According to classical interpretations, his myth is a metaphor of the death and rebirth of nature. The festival Hyacinthia included the initiatory rites, that is, the initiation of youths into adulthood.