Hello Gardeners, I’m Amanda McNulty with Clemson Extension and Making It Grow . Helianthus annuus, the annual flower that produces seeds with commercial value, is native to the prairies of the mid-western area but now is found all over the US and Canada. We have several sunflowers that are evolved in our part of the country. One of particular interest is Helianthus schweinitzii, or Schweinitz sunflower. This plant is endemic to certain parts of North and South Carolina. Endemic meaning a plant