I had decided to grow mainly "old" varieties this year, starting with seeds from 2008. Those failed to germinate - so far. But I did not toss them yet, as in the past, I had germination of a seed after 11 weeks, a seed I had totally neglected. But all other old seeds germinated very well and now I have way more seedling than I had expected. All seeds from 2008 - 2015 were pre-soaked in diluted fish emulsion for 48 hours, but regarding the almost 100% germination, I wonder if it was really necessary. I'll try other old varieties next year - without any pre-treatment.
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