Good question! Growers who have left sunflowers out all winter have had a good percentage of the seeds germinate, so you should be ok with at least a good percentage, too. But how about this: If you have more than one flower, harvest one before the freeze to see if there is any difference.
Good question! Growers who have left sunflowers out all winter have had a good percentage of the seeds germinate, so you should be ok with at least a good percentage, too. But how about this: If you have more than one flower, harvest one before the freeze to see if there is any difference.