Reddit user Independent-Design17 proposed a fascinating theory: Elden Ring's Erdtree might be inspired by the Australian Christmas tree, Nuytsia floribunda.
Superficial similarities are undeniable, particularly when comparing the in-game Small Erdtrees to Nuytsia. However, fans have uncovered deeper connections. In Elden Ring, the Erdtree guides the souls of the deceased, reflected by the game's catacombs located at its base. Intriguingly, Nuytsia holds similar spiritual significance in Australian Aboriginal culture, its blossoms representing the souls of the departed, their vibrant hues mirroring the sunset – the believed destination of spirits.
Further strengthening the connection is Nuytsia's semi-parasitic nature; it thrives by drawing nutrients from neighboring plants. This resonates with a popular fan theory suggesting the Erdtree is 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 incorporated these Nuytsia parallels remains a mystery, known only to the developers themselves.