Fortunately, we are not seeing it used as a centerpiece for circular beds in the middle of lawn spaces as was the fashion a hundred years ago. Cannas are considered root hardy only through Zone 8, but we gardeners are always pushing that limit. In a garden I tended a few years ago, I could tell how hard the winter had been by how close to the house the surviving canna were. In bad years, just a few plants survived right next to the foundation, but in mild winters all of the plants survived. Cannas do best when they are reasonably moist, but they seem to resent too much soil moisture in the winter.
Full sun is the best location to grow cannas.
They do best in a fertile soil but will grow in most soils if they receive the water they need. If winter hardiness is a concern, cut the clump off in November with the first frost and cover the plant over with 8 to 12 inches of leaves. Or, if you have a suitable location, the rhizomes can be dug with a clump of soil attached each fall. The roots then are stored over winter in an area that will stay cool and dry, but not freeze. The crawl space beneath the home makes an ideal storage location.