@sueinmn I knew there were a few varieties but didn't know the difference. I did find a sawtooth sunflower (Helianthus grosseserratus) that I am considering buying some seeds on Prairie Moon Nursery website (https://www.prairiemoon.com/helianthus-grosseserratus-saw-tooth-sunflower-prairie-moon-nursery.html). The flowers are small and it's more like a tall grass plant which may be nice as a border along the edge of my wooded area. I do like the large sunflowers though and am planning on getting some of those. I wasn't sure if they would reseed themselves.