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I've grown them before, inadvertently. My wife had a long flower bed around a circular drive in front of our house when we lived in Texas. I dug out the bottom of the chicken pen after a few years of running chickens in there and used it to top dress the flower beds. The problem was that the material I dug out of the pen was loaded with old sunflower seeds, just generic BOSS that I was buying at the feed store. They sprouted, so I let them grow. We had hundreds of plants that grew 5 or 6 feet tall. At the end of the season I cut the heads, spread them out on the back porch to dry, and then filled several large plastic totes with them. I'd throw the heads to our hens and let them clean out the seeds.