I found out they are sold by California Giant blueberries and there referred to as "DUKE" if that helps anyGardenRN wrote:If you're talking about store bought blueberries that you squeezed the seeds out of vs. store bought blueberry seeds, yes they need to be cold stratified. You'd have to google it but I believe they need to be chilled for at least a month. I think it's about 800 hours. If not, you can try all you'd like, they just won't grow. I know that's not the exciting answer, but sometimes there's no shortcut. Good luck!