Because of its sheer size, it was meant to be lording over lesser plants, so God didn't like this arrogance, uprooted it, and planted it upside down, hence its particular shape.
Data la sua grande dimensione, era destinata a comandare  sulle piante minori, ma Dio a cui non piacque  questa arroganza, la sradicò, e la ripiantò a testa in giù, da qui la sua forma strana.