What plant in a black pot?
It's certainly possible Cephs routinely send out growths at some depth. *In a clear, narrow pot, the growth would see light and starts leaves while still, say, 3" down. *In the real world or another kind of pot, the growth would turn upwards seeking light. *If a plantlet did try to form 3" down in a black pot, no one would know unless the plant were repotted before the new growth died. *But I don't think leaf growth would be triggered without enough light.
The mother plant is in a 4" (dark) pot now and I'll be watching to see if new growth centers appear out in the periphery. *Ceph suburban sprawl, of sorts. *I've always kept them in cramped pots, so I've never seen it. *Lots of plants spread that way, which is why I find red raspberries popping up way beyond the raspberry patch and why I'm wondering how I'm going to rein in the Jerusalem Artichokes I planted last year.