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Calla Few bulbs are as elegant as calla (Zantedeschia). The gorgeous blooms appear in a wide range of shades including white, pink, red, orange, yellow, and deep burgundy. Most varieties have great foliage, too: The arrowhead-shaped leaves are often dotted in white. Most varieties grow about a foot tall. How to Grow Them: Callas like a spot in full sun or part shade and moist soil. They're frost tender, so in areas that experience freezing temperatures treat them like an annual or dig and store them a frost-free place over winter.