Red Sister plants (Cordyline fruticosa "Red Sister") are a variety of evergreen tropical shrub that belongs to the lily family. Also known as the ti plant or the Hawaiian good luck plant, the many varieties of cordylines are prized for their foliage. The Red Sister plants are cultivated for their dense, leathery leaves. They are not invasive, can be grown outside in extremely warm climates and are grown as houseplants in cooler areas. The leaves range from pink through deep burgundy, depending on growing conditions and light received.