Reddit user Independent-Design17 proposed a fascinating connection between Elden Ring's Erdtree and Australia's Christmas tree, Nuytsia floribunda. Superficial similarities are evident, particularly when comparing the smaller Erdtrees in the game. However, the parallels run deeper.
Elden Ring lore suggests the Erdtree guides the souls of the deceased, explaining the catacombs at its base. Intriguingly, Nuytsia holds a similar spiritual significance in Aboriginal Australian culture. Its blossoms represent the souls of the departed, and its vibrant hues are linked to the sunset, the perceived destination of spirits.
Further strengthening the comparison is Nuytsia's semi-parasitic nature; it draws nutrients from surrounding plants. This mirrors a popular fan theory suggesting the Erdtree is parasitic, having usurped the life force of an ancient Great Tree (though game descriptions clarify this refers to the Erdtree's own extensive root system, not a separate entity).
Ultimately, whether FromSoftware intentionally drew inspiration from Nuytsia remains a mystery.