My jades start getting those red edgings when it gets some stress and chilled during our winters. In 2012, I remember we got really chilly mornings and some days of rain, then bright and sunny, so most of the leaves turns red, similar to what my other succulents do when they get really cold stressed.
2012Feb
Right now, we got good cool overnights and warm daytime Feb temps, so plant is just happily green. But it is in dropping the lower older leaves cycle. I like it, it does its own trimming, but making new leaves as well at the tips or anywhere along the branches.
