That is an interesting observation @fenngen. As far as I understand the sunflowers in our country are clean but possibly the ones you bought weren't? I avoid seed or foods I know aren't heirloom and I've never had sunflowers not germinate - although I know a lot of other vegetable seeds (like pretty much all maize and tomatoes) are GMO
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I really don’t know, maybe I just didn’t do things right, but there wasn’t a single sprout.