I recently purchased a N. ventricosa x inermis rooted cutting. It seemed healthy upon arrival and I promptly potted it up. For some unknown reason, it has begun to die. A blackness is spreading from what seems like the roots up through the stem, taking the leaves with it. I emailed the vendor about a possible replacement, because I haven't done anything to cause such a quick demise. But in the meantime I'm considering taking a cutting of the healthy green portion of the plant. Is this possible to perform on what has been sold to me as a rooted cutting?
In other words: Can I take a cutting of a cutting?