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.
The temperature of Rhode island has been relatively stable since the end of the last advance of the ice age. Now things are slowly changing... The new updated 2012 USDA Plant Maturity Zone map indicates that there are three Growing Zones in Rhode Island; 6a, 6b and 7a! The older 1993 Growing Zone Map from the USDA showed only two coller growing zones in Rhode Island; 5b and 6a.