Retinal detachment is a very serious eye condition that happens when the retina separates from the tissue around it. Since the retina can't work properly under these conditions, you could permanently lose vision if the detached retina isn't repaired promptly.
Plant Hardiness. Cannas are reliably hardy as far north as Zone 7, which includes New Yorkâs Long Island, Virginia, the Delmarva peninsula, southern Tennessee, mid-state Missouri, southern Oklahoma and parts of the Texas panhandle, as well as patchy areas of the Sierra Nevadas and West Coast mountain ranges.
USDA Plant Hardiness Zone 8b. Zone 8b is located in the lower 55 percent of the state of Louisiana, where the minimum temperature is between 15 and 20 degrees F. The plants and trees in this zone do not need to be as cold hardy as the plants in zone 8a, but they need to do well in extreme heat and humidity.