Japanese aralia is a demanding house plant that prefers cool conditions and high humidity.
The Japanese aralia is a fast-growing shrub with broad, hand-shaped, leathery leaves that grow up to 18 inches wide. They can be medium green or variegated with yellow or white.
Excessively warm temperatures in winter, especially in the presence of dry air, can cause serious leaf drop. If this happens, prune severely, leaving the base of the plant bare. Avoid touching newly formed leaves -- they can be permanently damaged.