Tropicals & Tender Perennials: What's the frost hardiest Canna?, 1 by dyzzypyxxy

dyzzypyxxy wrote:
Right, Olaf. It's the watery, fleshy rhizomes that are the problem with all cannas and cold weather. If the rhizomes freeze, the water in the cells expands and breaks the cell walls, so when they thaw, they rot.

Cannas do love lots of water, and I've even grown them in my fish pond one summer. But they got too tall, and kept falling over plus there wasn't enough sun so they didn't bloom well. Now I grow the dwarf kinds in pots beside the pond.