Soapberry can refer to: Plants in the genus Sapindus, native to warm temperate to tropical regions in both the Old World and the New World. The berries of these plants contain a natural, low-sudsing detergent called saponin. Canada Buffaloberry (Shepherdia canadensis)'s also known as "soapberry" and's native to North America. This shrub bears bitter yet edible red berries.… (More on Soapberry)