It is a true statement. We do this with tomatato plants all the time. If you have ever looked closely at a tomatato plant you will notice tiny hairs on it, each hair can grow a new root system. So I cut it off then place it in a grow seed tray with some support and it grows a whole new plant. You do have to remove the leaves except the very top ones say 15-20 leaves should be left on the plant you want a bare stem up to that. Also works witha variety of ivy plants.