Okay, I hope this doesn't sound dumb but can I plant the sunflower seed that is used for bird feed? I can buy it for $15 for 50 lbs at the ag store. I noticed that it always come up in places that the birds have dropped it and under the bird feeder. I want to grow a large field of sunflowers for bird and chicken food but there is a huge difference in the price that they are getting for the "seed for food" and the "seed for planting". Any thoughts?