I think the ones for bird seed mix may be treated to not sprout. I don't have a bag on hand, and I often use a mix I'm perfecting for the wide variety of wild birds I get. However, I feel like the ones I usually buy say they are treated to not sprout. Just a thought :)
Where do you get your sunflower seeds to sprout?
I was mentioning on another thread that I want to get cayugas here in Oregon but not shipped. Any suggestions on how to find a place? Holderread is cutting cayugas this spring and I'll want to get them in April.