Planchonella sandwicensis, commonly known as ʻĀlaʻa, Āulu, or ʻĒlaʻa, is a deciduous tree endemic to the Hawaiian Islands. It is found in a variety of habitats including dry, coastal mesic, and mixed mesic forests, typically at elevations ranging from 787 to 3215 feet. This species can grow to a height of 49 feet with a trunk diameter of about 1 foot. The tree’s thick, grey bark is notably fissured and reveals an orange inner layer when cut. Planchonella sandwicensis is characterized by its oblong, leathery leaves and bell-shaped flowers that grow in clusters. The fruit is a berry that can be yellow, orange, or purplish-black when ripe.

In cultivation, ʻĀlaʻa is valued for its cultural significance and ornamental features, including its attractive bark and foliage. It is used in native plant gardens and restoration projects to promote biodiversity and preserve Hawaiian cultural heritage. The tree prefers well-drained soils and can tolerate a range of light conditions from full sun to part shade. It is relatively low-maintenance once established but may require protection from pests and diseases that are not present in its native habitat. The wood of Planchonella sandwicensis has a history of use in traditional Hawaiian construction, for crafting canoe parts, and for making tools, while the sap has been used as an adhesive and birdlime.CC BY-SA 4.0