Who grows a lot of sunflowers. I'm wanting to prepare a large garden site to grow suflowers for seed. Questions: 1. what variety is best for this (for wild bird and poultry seeds) 2. what can be interplanted with the sunflowers? Is there a variety of a climbing field pea or a pea to harvest as a dry storage pea? 3. Can you plant the black oil seed bought in the feed store that is used for wild bird feed, and expect a true harvest?