Kalanchoe hildebrandtii

Potting mix: They thrive in nutrient porous soils consisting of equal parts of loam and sand, with pumice or lava grit added to ensure good drainage.
Repotting: Repot them in Autumn and left outside in a bright but cool and dry location until the first frost. The cool temperature along with the shorter days at the back of the Solarium where the light levels are relatively low stimulate the production of abundant flower buds.
Hardiness: Kalanchoe hildebrandtii isn’t hardy to severe freeze but seems to tolerate everything else. It needs to be covered at least and housed in cold climates.
Exposure: Plant in full sun to partial shade but will grow in pretty deep shade without much trouble.

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz