Plant red canna rhizomes in the spring after danger of frost is passed. Choose a site with full sun and well-drained soil. Dig a hole about 2 to 4 inches deep. Place the rhizome in the hole, spreading the roots and making sure the "eyes" or buds are facing up.
Space rhizomes 1 to 2 feet apart if you're planting in groups. Cover the rhizomes with soil and gently compact the dirt.
Water thoroughly. Red cannas require moist soil, so water regularly, making sure the soil is wet but not soggy.
Deadhead spent flowers to encourage more blooms by clipping the flowers just below the flowerheads.
Dig up the rhizomes in the fall after the first frost in regions north of zone 8. Place them in a bag with moistened peat moss and store in a cool place. The rhizomes can then be replanted come spring.
Trim the cannas down to the ground and keep the rhizomes in the ground over winter in zones 8 to 10, but place a layer of mulch, grass clippings or pine needles over the rhizomes.