As with any succulent, over watering is usually the main culprit for failure. In my area it is easily rooted, even the leaf alone can start to root. I just usually let it callus for a few days, and stick it in dirt. Sometimes I may dip it in rooting hormone, but oftentimes, especially when weather is really warm, it does not even need it. There are times I can just stick the cut off leaf direct into dirt without waiting for it to callus. I would know the leaf is starting to root when I see little plantlets growing. I guess it depends how warm it is already. But to play safe, have it callus, dip in some rooting hormone and stick into dirt, put in a shady side for awhile. I do not water yet the cutting. I wait for a few days. And when I resume watering, I just water sparingly enough to dampen the soil but not too soggy. Jades are not that fast growers, but very resilient. So patience in watering, if it looks damp, do not water.
