A cordyline plant offers tropical foliage and vibrant colors for gardens and patio pots. Peter Krumhardt Cordyline plants bring tropical lushness to backyard beds and patio pots. This genus of evergreen flowering plants is prized for brightly colored foliage and an upright form when planted outdoors in the landscape. Cordylines (Cordyline spp.) are perennials in USDA Zone 9 and warmer. However,...