I've got one under a year old. It was fantastic to watch the red sprout (I got 2 sprouts, a twin tree from one seed) and the black leaves grow, the thing doubled in size daily for a couple of weeks. The black leaves double daily until they start to turn green.

I'm under a year in with this thing and I was wondering how it would start branching out, if leaves would become branches or what. Seeing the budding at the top at the end was pretty cool. Now I know what to expect.