They never go out, never fade, never decide to stop being of interest. Cannas thrive in heat, bloom until frost and need little care. Most gardeners grow cannas from rhizomes, which can be planted in spring as soon as it's comfortable to be in the garden in shirtsleeves. They need a sunny spot but are not particular about soil. As long as they receive plenty of moisture, they will flourish.
Cannas thrive at the edge of a pond and even can be planted in pots placed underwater.
Although tall varieties grow to 7 feet or more, they are sturdy plants and shouldn't need staking, even in fairly windy spots. For all their assertiveness, cannas are easy to combine with other plants, Maurer says. You can intensify color with them. You can make soothing or arresting combinations. It all depends on what you mix them with.