The Cabbage Tree Cordyline australis features sword-shaped gray-green leaves, making it a popular choice for houseplants. This tree is native to New Zealand and was introduced to the U.S. in the early 1800s. The fragrant white flowers bloom in late spring to early summer. Plant accordingly for a mature height of 20-30’ tall. Cabbage Tree (Cordyline australis) is winter hardy in USDA Zones 9-12. It's adaptable to a wide range of soil conditions, from boggy to dry, making it a great choice for many climates. When planted in containers, keep the soil moist in summer but reduce in winter, and place outside patios or bring indoors as a houseplant. The taproot requires a large and deep container for optimal growth.