Names can be confusing. There are Calla lilies and canna. They both arise from tubers/rhizomes but are quite different plants. I'm going to assume you are asking about Calla lily. Are these outside or inside? Did you buy a dormant rhizome or a potted plant and how big was it? If the rhizome/tuber was small, say under 3 inches across, it may need a bit more time to develop flowers. They should reach bloom size this summer. Calla lily need plenty of sun, at least 6 hours of direct sunlight, and moist soil. Growing indoors can make it difficult to get the necessary amount of sunlight. If you are growing in a container, some fertilizer is necessary but don't go over-board. Too much nitrogen often leads to lush green growth at the expense of flowers. Here is an article that may be helpful. Note that there are other calla lily topics on the right sidebar. https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/container-grown-calla-lilies.htm
Answered on July 8, 2018
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