Kalopanax septemlobus, commonly known as castor aralia, is a deciduous tree native to cool temperate forests, often found on mountain slopes and in valleys in northeastern Asia, including regions of Japan, Korea, and eastern China. It can grow up to 98 feet tall with a trunk diameter of 3-5 feet. The tree has a broad, irregular crown and deeply palmately lobed leaves that can be up to 12 inches wide. Its small, creamy white flowers bloom in large, showy umbels during late summer, followed by small black drupes that are attractive to birds.

Castor aralia is appreciated for its unique foliage and architectural form, making it a striking specimen tree in large gardens and parks. It is also used in reforestation projects in its native range. The tree is adaptable to a variety of soil conditions but prefers well-drained soils and can tolerate both full sun and partial shade. While it is relatively low-maintenance, it may require pruning to maintain a desirable shape. Gardeners should be aware that the tree has spiny stems, which can be a deterrent for planting in areas with high pedestrian traffic. It is also potentially invasive outside its native range, so it is crucial to consult local regulations before planting.CC BY-SA 4.0