"Calandiva" kalanchoe (Kalanchoe blossfeldiana "Calandiva"), a cultivar developed in the Netherlands, flowers for six full weeks in late winter and early spring. You can grow it outdoors in U.S. Department of Agriculture plant hardiness zones 10 through 12 or as a houseplant in colder climates. "Calandiva" gets along well with minimal care and will flower in the middle of winter -- as long as it's indoors -- with only minor manipulation.
Kalanchoe plants that grow indoors should be watered when a top 3-4 inches (7-10 cm) of soil dries out. Plants that grow outside will not usually need extra watering as they do well with water that a rain provides.
Liquid fertilizers are applied more frequently, bi-weekly or monthly, for example. Granular products are used less frequently, perhaps once every month or two. Slow-release houseplant fertilizers break down slowly and release their nutrients in small amounts, over a longer period of time. A single application of most of these products lasts for three to four months.
Normal home temps are fine. The summer and winter temps really vary here in Tucson and my Kalanchoe outside (in bright shade) does okay. As with any flowering plant, the hotter your home is the faster the flowers will open up, and the shorter the period of bloom will be.
Increase pot size by 2.5-5 cm (1 to 2 inches) in diameter for plants that are growing in pots 25.4 cm (10 inches) in diameter or less. For larger plants, those growing in pots greater than 10 inches in diameter, increase the pot size by 5 or 7.62 cm (2 or 3 inches) in diameter.
