The canna lily plant has tropical-like foliage and large flowers that resemble that of iris. Canna lilies are low maintenance and easy to grow, and both their flowers and foliage offer long-lasting color in the garden. Cannas like moist conditions, but will tolerate nearly any well-draining soil that is either neutral or slightly acidic. They appreciate bog-like conditions as well. When growing cannas in the garden, placing them in mixed borders or group plantings will offer the most dramatic effect.