Reddit user Independent-Design17 proposed a fascinating connection between Elden Ring's Erdtree and the Australian Christmas tree, Nuytsia floribunda. Superficial similarities exist, particularly between the in-game Small Erdtrees and Nuytsia. However, the parallels run deeper.
In Elden Ring lore, the Erdtree guides the souls of the deceased, explaining the catacombs at its base. Interestingly, Nuytsia holds similar spiritual significance in Australian Aboriginal culture, its flowering branches representing the souls of the departed, their vibrant hues echoing the sunset, the perceived destination of spirits.
Further bolstering this comparison is Nuytsia's semi-parasitic nature; it draws nutrients from surrounding vegetation. This resonates with fan theories positing the Erdtree as parasitic, having usurped the life force of an ancient Great Tree. However, game lore clarifies that references to a "Great Tree" are likely mistranslations, referring instead to the Erdtree's own extensive root system.
Ultimately, whether FromSoftware intentionally drew inspiration from Nuytsia floribunda remains a mystery known only to the developers.