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I've never succeeded with punicea.
Mec punicea seed should be sown as fresh as possible to get good germination.
I think it's down to them needing a prolonged freeze to germinate, I never had issues in Norway, but they (the exact same Holubec seeds as Leena) haven't germinated here in Denmark... I'll keep my fingers crossed they'll germinate next spring.
I hope yours germinate next year.