Answer: Cannas will grow in containers, and they like heat and sun. However, they also need plenty of water and a rich soil to do their best. At five feet and up, the larger cannas will have huge underground roots or rhizomes by the end of the summer and may literally not fit in a ten inch deep box. You might try some of the tall ornamental grasses, or perhaps some annual vines in the boxes, or taller annuals such as cosmos. Another possibility might be to raise the boxes up off the ground and get some extra heigh that way. Whatever you use, the larger plants will use a lot of water in mid summer when the weather is hot. You may want to use some fo the water holding polymer in the potting mix to help it stay hydrated better.
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