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Sounds great ... the original ones I grew from seed only made a single bulb in the first year. Then they divided in the second year.Mine have not done so well this year - making far smaller onions and dying back at the beginning of July - I don't know whether that's because of the conditions or the different area of the allotment I'm growing them on. One particularly large one I saved from last year split in to about 20 but those onions were so tiny that I'm not sure they'll keep through to next year!
What size are the bulbs? My seed-grown Green Mountain descendants are small, and only have a single bulb. So far they all look similar, but I haven't disturbed any of them at all.
Last year mine made 4 inch onions - but this year none are bigger than 2 inches and they have all completely died so I harvested them ...That one that split in to 20 looked like a bit of an oddball - it can't be genetically different to the others as it came from the same seed. My guess is that if they keep then they will act like onion sets - each one making a single bigger onion next year - but I might be wrong.
Your shallots are looking great
Interesting that so many are still green and lush and going well. Are potato onions less daylength sensitive than onions? Or is it all a matter of selection and different ways of growing over a long time.