Why this 40-year-old tree is starting to drop its leaves

At first glance, it seems strange that a plant commonly referred to as Hawaiian elf (Schefflera arboricola) is neither native to Hawaii nor elfish, growing to a height of at least ten feet. It transpires that the elf moniker is meant for contrast, referring to the fact that the potential height of Hawaiian elf at maturity is only half that of its close relative, the umbrella tree (Schefflera actinophylla). Hawaiian elf is a durable indoor plant and one of the most reliable species for half-day s