I walked through the garden this morning and there they were, risen from nowhere. Like everything else about this plant, they're big; each one is the size of an adult's fist. They look like clonal aliens ought to hatch out of them at any minute. If they do, I hope I'm there to see them.
Our Tetrapanax flowered in the collection last year, too late in the season to set viable seeds. If I see seeds develop on this plant I'm killing it and every other one I can find. This is one scary plant. One very cool scary plant.