Plant Overview Common Name Umbrella plant, Japanese aralia, false castor oil plant Origin These plants are native to the coastal woodlands of southern Japan and Korea Height 2 to 4 metres (6-13 feet), though it can be pruned to keep it smaller Light This shrub prefers a shady position and will not thrive in full sun Click to see full answer. People also ask, how do you grow Japanese Aralia?Japanese aralia grows well in part or full shade. Avoid planting it in areas that receive afternoon sun as its leaves will scorch in prolonged direct sun. Plant it in rich, moist soil that is well-drained. Plants growing in containers will thrive in a high quality, humus-rich potting mix.Furthermore, is Japanese Aralia poisonous? Although it can withstand sun, Japanese aralia prefers shade and rich well-drained soil. Its glossy green leaves can reach 16 inches across and look impressive in the dry shade garden. Unlike the look-alike (and poisonous) castor bean, Fatsia is not toxic to cats, dogs or people. Also Know, where does fatsia japonica grow? Fatsia japonica produces unusual white flowers in late autumn, normally October to November time. They aren’t particularly numerous and although they have novelty value, grow this plant for its leaves. They grow best in partial shade and tolerate full shade well. Avoid growing them in full sun.Can Japanese Aralia be grown indoors?The fatsia japonica plant, or Japanese aralia, originated in the sub-tropic forests of Japan, Korea, & Taiwan. Fatsia plants are a type of evergreen plant that can be grown both indoors as a houseplant and outdoors in frost-free areas.