I like to plant sunflowers and dry and save the heads for the chickens to have in the winter. They produce a lot of high oil feed for a fairly inexpensive price, and they're entertainment too. I hang one just above their reach so they can jump and peck at it. One will jump and knock seeds out, and the others will all scramble.
I had to fence the new plantings because Damn Bunny has been snipping every seedling that comes up right off at the dirt. Very frustrating!
I had three volunteer sunflowers come up in the middle of the yard this spring and I cut them and hung them up to dry last week. I will keep any useful volunteer, no matter how oddly placed in the yard it might be!