I noticed the quality varies also depending on vendor, you get with some a better quality seed.
My guess is simply the plant that specific poor seed came from. If they selected only the ones that got a good bulb, and let only those go to seed, I think the final quality would be much better, so essentially the variety is not pure. But this is only a guess, the best way one could test is to save their own seed, and I'm too lazy for that (also space).
If you want the best variety for more challenging conditions, Riesenbutter is the one. French Breakfast is the second best.
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