Canna lilies are big and bold, with leaves that fall into the "large" to "huge" range and flowers that follow suit. Site these horticultural Titans wherever moderate size shrubs would do, but would simple be too tame. . . as warm climate foundation plantings, along property lines lieu of fences and at the edges of ponds, reflected in the bright waters. Experiment with a few cannas and let your imagination go wild. Don't be timid.