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Last summer my potato onions kept growing quite late into summer. Since I wasn't planning to eat any, I just let them keep going because they hadn't shown signs of dying back yet and a good number of them started splitting/dividing at their sections. After harvesting and curing them I divided those that had split into more than one section and ended up with more seed onions. I was surprised by how large many of the onions got in their first year from seed (baseball size). After curing, I planted them all out in November, mulched them with 6" of horse manure + wood shavings. Since then that mulch shrank by half and the onions are just now making their appearance through it. I'm in zone 7b ish. Looking forward to see how they do this season and crossing my fingers for some flowers.