Not sure, but I first saw them several years ago in a Jackson & Perkins catalog. I immediately thought "but how can that bulb live?? And of course, it cannot - they are meant to be thrown away. An so I will never buy one. Since then, they seem to have taken off - but perhaps it is just a fad. If sales go down, then they will stop making them. I wonder what the amaryllis growers have to say about this fad.