Arikara Sunflower Seeds (Helianthus annuus variety). Harvested from the gardens at Monticello. A primary goal of the Thomas Jefferson-sponsored Lewis and Clark Expedition was botanical exploration of North America. In 1805 the members of the 'Corps of Discovery' spent six winter months at Fort Mandan on the Missouri, near the Arikara, Hidatsa, and Mandan villages. The Arikara people planted these Sunflowers as the ice broke on the Missouri River, with soil temperatures at 45AdegF, because the seeds will not germinate in... - Arikara Sunflower Seeds (Helianthus annuus variety). |