Purple osier is commonly known as the purple willow. This woody plant belongs to the willow family and is known for its purple or reddish color. The scientific name for purple osier is Salix purpurea. This shrub-like plant can grow up to 13 feet high and is often used for ornamental purposes in landscaping. Some common synonyms for purple osier include purple willow, purple osier willow, red willow, and purple stem willows. These synonyms are used interchangeably to refer to the same plant. Whether you call it purple osier, purple willow, or any of its other synonyms, this plant will add a pop of color to any garden.