Clivia Rhizome Vibrant and colorful clivia flowers (Clivia miniata) brighten up the late winter and early spring landscape. Clivia plants grow 20 to 24 inches tall and bloom in shades of red, orange, apricot and yellow. When not in flower, the foliage adds a lush tropical note to the garden. Plant clivia plants from dormant tubers in fall, winter or early spring.